<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:cb27e67d-68e2-46d9-8fae-f2c0d10918c2,g:1e0dcd03-e767-4b69-9cb6-89c70bc38da6-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.activision.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="atvi-20211231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended" id="ic2c2e72d0a26474fb9a72ad46abc4ddb_CONSOLIDATEDSTATEMENTSOFOPERATIONS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_3758aeb6-4543-4fc9-9bef-fcb8f26514b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_RevenuesAbstract_3758aeb6-4543-4fc9-9bef-fcb8f26514b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e3a7948f-4446-4838-89aa-f4cb3fd5a980" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_3758aeb6-4543-4fc9-9bef-fcb8f26514b6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e3a7948f-4446-4838-89aa-f4cb3fd5a980" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_ef0f0664-0dc2-4bca-b26f-679b31fd5e35" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_CostOfRevenueAbstract_ef0f0664-0dc2-4bca-b26f-679b31fd5e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_62b93a5d-aeba-4a50-868d-fe7e01918f21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_ef0f0664-0dc2-4bca-b26f-679b31fd5e35" xlink:to="loc_us-gaap_CostOfRevenue_62b93a5d-aeba-4a50-868d-fe7e01918f21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_aed182a1-31d6-4a25-a384-4b08a16823d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_aed182a1-31d6-4a25-a384-4b08a16823d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_2f869305-09bd-4351-8623-11568bd29fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_SellingAndMarketingExpense_2f869305-09bd-4351-8623-11568bd29fb4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_9fe36e73-68a6-488b-acda-4fb9520585b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_9fe36e73-68a6-488b-acda-4fb9520585b5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_25ade250-703d-400f-a69b-acbd4414a7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_RestructuringCharges_25ade250-703d-400f-a69b-acbd4414a7d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_ce16c904-a0a7-4057-8058-f677127cbbc3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_3449f10c-5cd9-4c11-a9f5-fcd9d72aea24" xlink:to="loc_us-gaap_CostsAndExpenses_ce16c904-a0a7-4057-8058-f677127cbbc3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_8a4098cd-12c4-488d-8a05-7a3eb36be354" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_OperatingIncomeLoss_8a4098cd-12c4-488d-8a05-7a3eb36be354" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_69f0f224-d9d8-4c96-aa6b-db5d1f40f3c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_69f0f224-d9d8-4c96-aa6b-db5d1f40f3c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3a67cbe5-a630-44cb-9902-50b156bd88c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3a67cbe5-a630-44cb-9902-50b156bd88c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_54a657a5-ec73-457a-9d93-dd47917a5f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_54a657a5-ec73-457a-9d93-dd47917a5f9b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_d5c02514-4fb0-49d5-9184-fd0ee794a66e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_d5c02514-4fb0-49d5-9184-fd0ee794a66e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e7ba9c99-7dfc-4026-8911-320fd9d68a10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_NetIncomeLoss_e7ba9c99-7dfc-4026-8911-320fd9d68a10" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_339fef4b-9dd2-4115-aab4-b89de9a80168" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_EarningsPerShareAbstract_339fef4b-9dd2-4115-aab4-b89de9a80168" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_8482273d-5278-45f8-8118-1d3ff173c1b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_339fef4b-9dd2-4115-aab4-b89de9a80168" xlink:to="loc_us-gaap_EarningsPerShareBasic_8482273d-5278-45f8-8118-1d3ff173c1b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_7e106bdb-a5a6-4408-bb20-feeff2e84536" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_339fef4b-9dd2-4115-aab4-b89de9a80168" xlink:to="loc_us-gaap_EarningsPerShareDiluted_7e106bdb-a5a6-4408-bb20-feeff2e84536" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2f540726-d3db-42f2-a720-edb363d25492" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2f540726-d3db-42f2-a720-edb363d25492" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c29c4aa2-3e9b-4cb9-bf4e-5390c9a11514" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2f540726-d3db-42f2-a720-edb363d25492" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_c29c4aa2-3e9b-4cb9-bf4e-5390c9a11514" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_af368710-1851-45db-9617-2261eecc54c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2f540726-d3db-42f2-a720-edb363d25492" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_af368710-1851-45db-9617-2261eecc54c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_106aae53-bb1d-4e87-982f-a1894eb4a4b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2868a56c-3607-489f-ad39-fb3c1d0cd818" xlink:to="loc_us-gaap_StatementTable_106aae53-bb1d-4e87-982f-a1894eb4a4b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bba03912-6812-4b78-9d81-3926e9effb19" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_106aae53-bb1d-4e87-982f-a1894eb4a4b1" xlink:to="loc_srt_ProductOrServiceAxis_bba03912-6812-4b78-9d81-3926e9effb19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bba03912-6812-4b78-9d81-3926e9effb19_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_bba03912-6812-4b78-9d81-3926e9effb19" xlink:to="loc_srt_ProductsAndServicesDomain_bba03912-6812-4b78-9d81-3926e9effb19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7cba6c6d-2256-4390-84bc-c7473e1dd867" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_bba03912-6812-4b78-9d81-3926e9effb19" xlink:to="loc_srt_ProductsAndServicesDomain_7cba6c6d-2256-4390-84bc-c7473e1dd867" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_699ae363-69bc-488d-8f53-fab58d2dcd85" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7cba6c6d-2256-4390-84bc-c7473e1dd867" xlink:to="loc_us-gaap_ProductMember_699ae363-69bc-488d-8f53-fab58d2dcd85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ProductSalesProductCostsMember_c9e84f5c-968a-45dd-b4bd-a2aa0a2c3e70" xlink:href="atvi-20211231.xsd#atvi_ProductSalesProductCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_699ae363-69bc-488d-8f53-fab58d2dcd85" xlink:to="loc_atvi_ProductSalesProductCostsMember_c9e84f5c-968a-45dd-b4bd-a2aa0a2c3e70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_40da92de-4324-4a8a-bdf8-ce487c4952d4" xlink:href="atvi-20211231.xsd#atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductMember_699ae363-69bc-488d-8f53-fab58d2dcd85" xlink:to="loc_atvi_ProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_40da92de-4324-4a8a-bdf8-ce487c4952d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InGameSubscriptionAndOtherMember_fdacbc47-b74f-479b-be71-4870028485da" xlink:href="atvi-20211231.xsd#atvi_InGameSubscriptionAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7cba6c6d-2256-4390-84bc-c7473e1dd867" xlink:to="loc_atvi_InGameSubscriptionAndOtherMember_fdacbc47-b74f-479b-be71-4870028485da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember_5fe6e1c9-2442-41f0-bb20-a6cf1b0cbbba" xlink:href="atvi-20211231.xsd#atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_InGameSubscriptionAndOtherMember_fdacbc47-b74f-479b-be71-4870028485da" xlink:to="loc_atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember_5fe6e1c9-2442-41f0-bb20-a6cf1b0cbbba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember_c62487a3-ce6f-4de2-b43c-8ef99b4e852a" xlink:href="atvi-20211231.xsd#atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_InGameSubscriptionAndOtherMember_fdacbc47-b74f-479b-be71-4870028485da" xlink:to="loc_atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember_c62487a3-ce6f-4de2-b43c-8ef99b4e852a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY" xlink:type="simple" xlink:href="atvi-20211231.xsd#CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY" xlink:type="extended" id="i4bbcb8246f0c40eb913c7a82700909cf_CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_41f15a50-8ab7-4af4-89d5-abf5469f13ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_41f15a50-8ab7-4af4-89d5-abf5469f13ed" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_1e5bb571-26d8-4244-a014-5909fc1c6b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_SharesIssued_1e5bb571-26d8-4244-a014-5909fc1c6b5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_375f6dc7-7928-457c-ac3b-7a50c4694856" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_StockholdersEquity_375f6dc7-7928-457c-ac3b-7a50c4694856" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_be930896-80fa-4ccb-8e4d-22c5df3ff22c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_be930896-80fa-4ccb-8e4d-22c5df3ff22c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_c8af1188-e4ae-4a7b-8137-7e6e4ff6c50b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_be930896-80fa-4ccb-8e4d-22c5df3ff22c" xlink:to="loc_us-gaap_NetIncomeLoss_c8af1188-e4ae-4a7b-8137-7e6e4ff6c50b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_871331b5-6be8-4fe3-af5c-698a53afda4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_be930896-80fa-4ccb-8e4d-22c5df3ff22c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_871331b5-6be8-4fe3-af5c-698a53afda4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_b56d8094-407e-4777-9b61-118a8c605fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross_b56d8094-407e-4777-9b61-118a8c605fb1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_a9c46ec0-7ec4-4cae-ba67-cea014ce71f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross_a9c46ec0-7ec4-4cae-ba67-cea014ce71f0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_a91ec457-791a-4b5d-b5ab-123e8c406f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_a91ec457-791a-4b5d-b5ab-123e8c406f8e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_b18fe045-37f4-4625-b18a-46ad03bb1056" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_b18fe045-37f4-4625-b18a-46ad03bb1056" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_07b181f4-fcdd-4cba-8113-f3e4f1cdad69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_07b181f4-fcdd-4cba-8113-f3e4f1cdad69" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ae1c1548-fb52-44f8-bf34-7f767e44bbfe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ae1c1548-fb52-44f8-bf34-7f767e44bbfe" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_b776f654-8c7b-463e-8e02-d9a413521059" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_b776f654-8c7b-463e-8e02-d9a413521059" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_73a16b96-cd1a-45f7-83a2-4a95cc1c5ebb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bd1d7db2-784f-4f99-a0f6-6260424d7ad6" xlink:to="loc_us-gaap_DividendsCommonStockCash_73a16b96-cd1a-45f7-83a2-4a95cc1c5ebb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_6f94ee6a-b023-4ab5-8427-68ea841f6458" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_3aafe859-cf40-457e-b3f3-1105b93ef56d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3fc14ca9-7b4c-44d1-b467-14cbfbb46692" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_41f15a50-8ab7-4af4-89d5-abf5469f13ed" xlink:to="loc_us-gaap_StatementTable_3fc14ca9-7b4c-44d1-b467-14cbfbb46692" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_e7fde635-ec38-4c26-8937-516743c0593c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3fc14ca9-7b4c-44d1-b467-14cbfbb46692" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_e7fde635-ec38-4c26-8937-516743c0593c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e7fde635-ec38-4c26-8937-516743c0593c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e7fde635-ec38-4c26-8937-516743c0593c" xlink:to="loc_us-gaap_EquityComponentDomain_e7fde635-ec38-4c26-8937-516743c0593c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e7fde635-ec38-4c26-8937-516743c0593c" xlink:to="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f19f7f3c-6482-4518-9a45-7fdf8891707d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:to="loc_us-gaap_CommonStockMember_f19f7f3c-6482-4518-9a45-7fdf8891707d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_b7fb35a6-186b-436d-bea1-78fb8b2665ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:to="loc_us-gaap_TreasuryStockMember_b7fb35a6-186b-436d-bea1-78fb8b2665ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_7819eacf-3709-4885-bb36-3334adfea793" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_7819eacf-3709-4885-bb36-3334adfea793" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_ea5a426c-d528-46f7-a0ee-46d5ae80421b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:to="loc_us-gaap_RetainedEarningsMember_ea5a426c-d528-46f7-a0ee-46d5ae80421b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4ca8d0af-2dc3-4b6a-a943-9a853996ac82" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_30b1f485-4a55-48ed-9dff-8358726283ab" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4ca8d0af-2dc3-4b6a-a943-9a853996ac82" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2560979c-fc59-4f84-a437-c8af23d85eef" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3fc14ca9-7b4c-44d1-b467-14cbfbb46692" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2560979c-fc59-4f84-a437-c8af23d85eef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_2560979c-fc59-4f84-a437-c8af23d85eef_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2560979c-fc59-4f84-a437-c8af23d85eef" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_2560979c-fc59-4f84-a437-c8af23d85eef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6ad0fb7-5521-45d2-b7c0-f3ca12c3da19" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_2560979c-fc59-4f84-a437-c8af23d85eef" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6ad0fb7-5521-45d2-b7c0-f3ca12c3da19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_5a3c9d35-cf74-4de6-951e-9278baeac981" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f6ad0fb7-5521-45d2-b7c0-f3ca12c3da19" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_5a3c9d35-cf74-4de6-951e-9278baeac981" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesScheduleofRevenuebyMajorCustomersDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SummaryofSignificantAccountingPoliciesScheduleofRevenuebyMajorCustomersDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesScheduleofRevenuebyMajorCustomersDetails" xlink:type="extended" id="i7938e51d1dfc412bbe28e0c711ad3ed8_SummaryofSignificantAccountingPoliciesScheduleofRevenuebyMajorCustomersDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_f816d794-a0c9-48b7-b5d5-188930a3e2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_636613bf-e7bd-4fa3-bee3-31aa19272721" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_f816d794-a0c9-48b7-b5d5-188930a3e2fa" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_636613bf-e7bd-4fa3-bee3-31aa19272721" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_02d9197a-8f34-4abb-bdf5-c5be574df234" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_f816d794-a0c9-48b7-b5d5-188930a3e2fa" xlink:to="loc_us-gaap_ConcentrationRiskTable_02d9197a-8f34-4abb-bdf5-c5be574df234" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_0308ed9d-d137-4227-bb0e-0e3e7c30d791" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_02d9197a-8f34-4abb-bdf5-c5be574df234" xlink:to="loc_srt_MajorCustomersAxis_0308ed9d-d137-4227-bb0e-0e3e7c30d791" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_0308ed9d-d137-4227-bb0e-0e3e7c30d791_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_0308ed9d-d137-4227-bb0e-0e3e7c30d791" xlink:to="loc_srt_NameOfMajorCustomerDomain_0308ed9d-d137-4227-bb0e-0e3e7c30d791_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_0308ed9d-d137-4227-bb0e-0e3e7c30d791" xlink:to="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_AppleMember_618b60b9-6ab8-4786-91c7-c40a1755c648" xlink:href="atvi-20211231.xsd#atvi_AppleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:to="loc_atvi_AppleMember_618b60b9-6ab8-4786-91c7-c40a1755c648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_GoogleMember_06439cf2-30ff-4674-bda9-d0c3f87c85a3" xlink:href="atvi-20211231.xsd#atvi_GoogleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:to="loc_atvi_GoogleMember_06439cf2-30ff-4674-bda9-d0c3f87c85a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_SonyMember_940a3535-1bc8-469d-8e21-459228ffc9e1" xlink:href="atvi-20211231.xsd#atvi_SonyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:to="loc_atvi_SonyMember_940a3535-1bc8-469d-8e21-459228ffc9e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_MicrosoftMember_ae2aa93a-8b89-49c9-9233-59c36ffeaf6f" xlink:href="atvi-20211231.xsd#atvi_MicrosoftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_7e6b2b1c-f4fa-4dc3-95fa-44f22fd4c1b5" xlink:to="loc_atvi_MicrosoftMember_ae2aa93a-8b89-49c9-9233-59c36ffeaf6f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_02d9197a-8f34-4abb-bdf5-c5be574df234" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_08136886-7755-4843-9376-c2f1610e3694" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_efa843d3-148f-4bf0-8151-9fdbf4b0f2fa" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_08136886-7755-4843-9376-c2f1610e3694" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember_841c539c-1f11-45cc-8d28-0b8725007e78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_08136886-7755-4843-9376-c2f1610e3694" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerProductAndServiceBenchmarkMember_841c539c-1f11-45cc-8d28-0b8725007e78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_152597e2-3d89-4e0a-8897-38d16534409b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_02d9197a-8f34-4abb-bdf5-c5be574df234" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_152597e2-3d89-4e0a-8897-38d16534409b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_152597e2-3d89-4e0a-8897-38d16534409b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_152597e2-3d89-4e0a-8897-38d16534409b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_152597e2-3d89-4e0a-8897-38d16534409b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b9960177-0c89-4fa6-8e54-17993578f3e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_152597e2-3d89-4e0a-8897-38d16534409b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b9960177-0c89-4fa6-8e54-17993578f3e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_187f0309-f0cc-4f79-9e5c-6ec1729ad7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_b9960177-0c89-4fa6-8e54-17993578f3e4" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_187f0309-f0cc-4f79-9e5c-6ec1729ad7bd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SummaryofSignificantAccountingPoliciesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="extended" id="ia8a2822fa91f451abc15e6c18c6acc1d_SummaryofSignificantAccountingPoliciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_d8794635-6dbd-42e8-aca3-ba582fe944ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_9f743cd6-088c-453e-9320-f4acba9f8203" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_d8794635-6dbd-42e8-aca3-ba582fe944ff" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_9f743cd6-088c-453e-9320-f4acba9f8203" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_d8794635-6dbd-42e8-aca3-ba582fe944ff" xlink:to="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_8d96e249-354b-4dbd-91c1-19a4a95d65d9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:to="loc_srt_MajorCustomersAxis_8d96e249-354b-4dbd-91c1-19a4a95d65d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_8d96e249-354b-4dbd-91c1-19a4a95d65d9_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_8d96e249-354b-4dbd-91c1-19a4a95d65d9" xlink:to="loc_srt_NameOfMajorCustomerDomain_8d96e249-354b-4dbd-91c1-19a4a95d65d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_5469b172-016a-4e68-8a18-fadb198659fd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_8d96e249-354b-4dbd-91c1-19a4a95d65d9" xlink:to="loc_srt_NameOfMajorCustomerDomain_5469b172-016a-4e68-8a18-fadb198659fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_MicrosoftMember_e81f0364-8262-46e9-80e3-4eec2f16761d" xlink:href="atvi-20211231.xsd#atvi_MicrosoftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_5469b172-016a-4e68-8a18-fadb198659fd" xlink:to="loc_atvi_MicrosoftMember_e81f0364-8262-46e9-80e3-4eec2f16761d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_SonyMember_2928d7a9-fede-4fc6-9c15-b5962b9f25da" xlink:href="atvi-20211231.xsd#atvi_SonyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_5469b172-016a-4e68-8a18-fadb198659fd" xlink:to="loc_atvi_SonyMember_2928d7a9-fede-4fc6-9c15-b5962b9f25da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019f638d-d940-4b17-aa09-c63485eba96b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019f638d-d940-4b17-aa09-c63485eba96b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019f638d-d940-4b17-aa09-c63485eba96b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019f638d-d940-4b17-aa09-c63485eba96b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019f638d-d940-4b17-aa09-c63485eba96b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_69636feb-abd0-4e66-910e-74d20ee97273" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019f638d-d940-4b17-aa09-c63485eba96b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_69636feb-abd0-4e66-910e-74d20ee97273" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_c7cb5fd0-ed5f-46ca-9698-2a1763a06d27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_69636feb-abd0-4e66-910e-74d20ee97273" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_c7cb5fd0-ed5f-46ca-9698-2a1763a06d27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9ea5a3d0-07ac-4b52-aa43-3f04f20b5f5a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9ce8d76d-c86a-436f-a1c8-6d87ad9a465a" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9ea5a3d0-07ac-4b52-aa43-3f04f20b5f5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_bee00e66-a19e-4598-b65a-427d4103a138" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9ea5a3d0-07ac-4b52-aa43-3f04f20b5f5a" xlink:to="loc_us-gaap_AccountsReceivableMember_bee00e66-a19e-4598-b65a-427d4103a138" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_03e19f17-ab77-4435-b37f-4efbc960759d" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_03692cd4-fa23-4c75-9850-e5fe458342f5" xlink:to="loc_srt_RangeAxis_03e19f17-ab77-4435-b37f-4efbc960759d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_03e19f17-ab77-4435-b37f-4efbc960759d_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_03e19f17-ab77-4435-b37f-4efbc960759d" xlink:to="loc_srt_RangeMember_03e19f17-ab77-4435-b37f-4efbc960759d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_82670fab-1f17-4bd7-a8e7-1e92fa6c1325" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_03e19f17-ab77-4435-b37f-4efbc960759d" xlink:to="loc_srt_RangeMember_82670fab-1f17-4bd7-a8e7-1e92fa6c1325" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_83dfedfb-0ddf-4582-9eac-8b8ad5cfd465" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_82670fab-1f17-4bd7-a8e7-1e92fa6c1325" xlink:to="loc_srt_MaximumMember_83dfedfb-0ddf-4582-9eac-8b8ad5cfd465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4f84fd97-c474-4a5d-946b-fe51492be457" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_82670fab-1f17-4bd7-a8e7-1e92fa6c1325" xlink:to="loc_srt_MinimumMember_4f84fd97-c474-4a5d-946b-fe51492be457" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_9f01b81f-0b7c-443a-86f4-955d88b853a1" xlink:href="atvi-20211231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod_7e53724b-0f1b-4f91-a5d6-7af030ea7d8e" xlink:href="atvi-20211231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_9f01b81f-0b7c-443a-86f4-955d88b853a1" xlink:to="loc_atvi_CapitalizedSoftwareDevelopmentCostsAmortizationPeriod_7e53724b-0f1b-4f91-a5d6-7af030ea7d8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_b547d919-1f89-4cc6-874e-2ff8f087516e" xlink:href="atvi-20211231.xsd#atvi_CapitalizedSoftwareDevelopmentCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsLineItems_9f01b81f-0b7c-443a-86f4-955d88b853a1" xlink:to="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_b547d919-1f89-4cc6-874e-2ff8f087516e" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_59b2b73e-0917-4eab-9df0-5ff6e22aafd5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_CapitalizedSoftwareDevelopmentCostsTable_b547d919-1f89-4cc6-874e-2ff8f087516e" xlink:to="loc_srt_RangeAxis_59b2b73e-0917-4eab-9df0-5ff6e22aafd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_59b2b73e-0917-4eab-9df0-5ff6e22aafd5_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a3f39611-2f2c-4305-9f78-46b11464513e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_10e884f6-481e-491b-9129-8f5d85e5fd6b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e0f7de4c-e67f-4a81-b933-e84cc759ab1b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SummaryofSignificantAccountingPoliciesLongLivedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesLongLivedAssetsDetails" xlink:type="extended" id="i7cf62bb23e9a462ea329ed92c128bddb_SummaryofSignificantAccountingPoliciesLongLivedAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1b414f3f-a80c-4875-ac16-b7d81c33d079" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_2ce1987c-5935-4977-b83c-8be9b1223a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1b414f3f-a80c-4875-ac16-b7d81c33d079" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_2ce1987c-5935-4977-b83c-8be9b1223a4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d15d10c1-9417-46d8-8c8a-ca986d88bf20" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1b414f3f-a80c-4875-ac16-b7d81c33d079" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d15d10c1-9417-46d8-8c8a-ca986d88bf20" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a420c845-52f3-4118-afa6-4a3d63da332d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d15d10c1-9417-46d8-8c8a-ca986d88bf20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a420c845-52f3-4118-afa6-4a3d63da332d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a420c845-52f3-4118-afa6-4a3d63da332d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a420c845-52f3-4118-afa6-4a3d63da332d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a420c845-52f3-4118-afa6-4a3d63da332d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fc21cfb4-77a2-4e06-8bb7-5f6454983677" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a420c845-52f3-4118-afa6-4a3d63da332d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fc21cfb4-77a2-4e06-8bb7-5f6454983677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_e5fef5b2-5bb3-4691-9bb2-6b41634c55ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fc21cfb4-77a2-4e06-8bb7-5f6454983677" xlink:to="loc_us-gaap_BuildingMember_e5fef5b2-5bb3-4691-9bb2-6b41634c55ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_78e8f6cf-b33f-4188-b99f-236dbd0ea6c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fc21cfb4-77a2-4e06-8bb7-5f6454983677" xlink:to="loc_us-gaap_ComputerEquipmentMember_78e8f6cf-b33f-4188-b99f-236dbd0ea6c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OfficeEquipmentMember_1edcb4c7-81f9-410d-967c-3b2e4885d752" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fc21cfb4-77a2-4e06-8bb7-5f6454983677" xlink:to="loc_us-gaap_OfficeEquipmentMember_1edcb4c7-81f9-410d-967c-3b2e4885d752" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_82295f5c-9127-4466-baee-a40c3681dc10" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_d15d10c1-9417-46d8-8c8a-ca986d88bf20" xlink:to="loc_srt_RangeAxis_82295f5c-9127-4466-baee-a40c3681dc10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_82295f5c-9127-4466-baee-a40c3681dc10_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_82295f5c-9127-4466-baee-a40c3681dc10" xlink:to="loc_srt_RangeMember_82295f5c-9127-4466-baee-a40c3681dc10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6b8729f6-c91f-4049-9ea2-d46928d9595e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_82295f5c-9127-4466-baee-a40c3681dc10" xlink:to="loc_srt_RangeMember_6b8729f6-c91f-4049-9ea2-d46928d9595e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_27a1294e-1a2b-4991-b03f-ebf76dda8494" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6b8729f6-c91f-4049-9ea2-d46928d9595e" xlink:to="loc_srt_MinimumMember_27a1294e-1a2b-4991-b03f-ebf76dda8494" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5667a500-531d-4762-aa10-270f76bdfbd5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6b8729f6-c91f-4049-9ea2-d46928d9595e" xlink:to="loc_srt_MaximumMember_5667a500-531d-4762-aa10-270f76bdfbd5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesGoodwillandOtherIndefiniteLivedAssetsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SummaryofSignificantAccountingPoliciesGoodwillandOtherIndefiniteLivedAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesGoodwillandOtherIndefiniteLivedAssetsDetails" xlink:type="extended" id="iaed3c85fe5004f7daa7d3bf08aaf0c10_SummaryofSignificantAccountingPoliciesGoodwillandOtherIndefiniteLivedAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_48ef1f4c-a1ae-4fae-b85b-ab62aac951cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_640bb561-5a47-4d9b-9c44-f3af16e31b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_48ef1f4c-a1ae-4fae-b85b-ab62aac951cd" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_640bb561-5a47-4d9b-9c44-f3af16e31b9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_601a554d-9092-4df1-a172-def86951f258" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_48ef1f4c-a1ae-4fae-b85b-ab62aac951cd" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_601a554d-9092-4df1-a172-def86951f258" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_bb850436-c47c-46d8-94ce-093d53f4167b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_48ef1f4c-a1ae-4fae-b85b-ab62aac951cd" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_bb850436-c47c-46d8-94ce-093d53f4167b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_0607d5b9-ece8-4554-a60a-9f2b2f548afa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_bb850436-c47c-46d8-94ce-093d53f4167b" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_0607d5b9-ece8-4554-a60a-9f2b2f548afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0607d5b9-ece8-4554-a60a-9f2b2f548afa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_0607d5b9-ece8-4554-a60a-9f2b2f548afa" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0607d5b9-ece8-4554-a60a-9f2b2f548afa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e69f2d16-f4f7-46e8-9ce9-a6895e92a2af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_0607d5b9-ece8-4554-a60a-9f2b2f548afa" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e69f2d16-f4f7-46e8-9ce9-a6895e92a2af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_43270705-050e-4840-9cc9-1d46413dc6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e69f2d16-f4f7-46e8-9ce9-a6895e92a2af" xlink:to="loc_us-gaap_TradeNamesMember_43270705-050e-4840-9cc9-1d46413dc6ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended" id="i60512eb6523b4acbb983e1013b3b6266_SummaryofSignificantAccountingPoliciesRevenueRecognitionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_2258c545-288b-4992-9271-b0dd60241f0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RequirementofPaymentTerm_e7633d5f-20b5-48fc-b717-da9dc7e97edb" xlink:href="atvi-20211231.xsd#atvi_RequirementofPaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2258c545-288b-4992-9271-b0dd60241f0f" xlink:to="loc_atvi_RequirementofPaymentTerm_e7633d5f-20b5-48fc-b717-da9dc7e97edb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_29f2644f-4ad8-4eee-a4bf-667adba25980" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_2258c545-288b-4992-9271-b0dd60241f0f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_29f2644f-4ad8-4eee-a4bf-667adba25980" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_73cbf182-530a-4528-b3d2-65668ada972a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_29f2644f-4ad8-4eee-a4bf-667adba25980" xlink:to="loc_srt_RangeAxis_73cbf182-530a-4528-b3d2-65668ada972a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_73cbf182-530a-4528-b3d2-65668ada972a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_73cbf182-530a-4528-b3d2-65668ada972a" xlink:to="loc_srt_RangeMember_73cbf182-530a-4528-b3d2-65668ada972a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_facaa0ab-a477-4fd7-ab3d-5eb3efbecda9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_73cbf182-530a-4528-b3d2-65668ada972a" xlink:to="loc_srt_RangeMember_facaa0ab-a477-4fd7-ab3d-5eb3efbecda9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4d946cfb-defd-4726-a0e9-57bf2916a9d6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_facaa0ab-a477-4fd7-ab3d-5eb3efbecda9" xlink:to="loc_srt_MinimumMember_4d946cfb-defd-4726-a0e9-57bf2916a9d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9c17b858-cdce-4439-8bb0-3613a18a727f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_facaa0ab-a477-4fd7-ab3d-5eb3efbecda9" xlink:to="loc_srt_MaximumMember_9c17b858-cdce-4439-8bb0-3613a18a727f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/PropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#PropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/PropertyandEquipmentNetDetails" xlink:type="extended" id="i8f525f4be8d94e3e99da4032ffb0c017_PropertyandEquipmentNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_14801f84-fdb4-4cde-be78-d1305dff2371" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_14801f84-fdb4-4cde-be78-d1305dff2371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_48950e6f-064a-4af7-9dd6-f0870ca24618" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_48950e6f-064a-4af7-9dd6-f0870ca24618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_06f94331-2e54-4c30-a258-71b8f75dc097" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_06f94331-2e54-4c30-a258-71b8f75dc097" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_f2b9707c-fd20-4d6f-a3cc-17fe3a135d67" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:to="loc_us-gaap_Depreciation_f2b9707c-fd20-4d6f-a3cc-17fe3a135d67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2f4ed666-4dde-4a07-ae79-83fce3be796d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c340ab67-e277-4b56-bb00-88fce2fb048e" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2f4ed666-4dde-4a07-ae79-83fce3be796d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ab464516-3643-4e98-920c-ad3ea714298a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2f4ed666-4dde-4a07-ae79-83fce3be796d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ab464516-3643-4e98-920c-ad3ea714298a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ab464516-3643-4e98-920c-ad3ea714298a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ab464516-3643-4e98-920c-ad3ea714298a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ab464516-3643-4e98-920c-ad3ea714298a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ab464516-3643-4e98-920c-ad3ea714298a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_5df8640c-7fba-4dc9-907a-ee75a2a31876" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:to="loc_us-gaap_LandMember_5df8640c-7fba-4dc9-907a-ee75a2a31876" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_ba1ca0d9-6681-4b0b-aeae-64a8353e7f62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:to="loc_us-gaap_BuildingMember_ba1ca0d9-6681-4b0b-aeae-64a8353e7f62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_0b31db56-0e44-4546-8201-66494008306c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdsAndLeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:to="loc_us-gaap_LeaseholdsAndLeaseholdImprovementsMember_0b31db56-0e44-4546-8201-66494008306c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_d099cf45-32fc-4dc0-a678-daa3442898a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:to="loc_us-gaap_ComputerEquipmentMember_d099cf45-32fc-4dc0-a678-daa3442898a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_5f819c9e-194f-40c5-8cf9-a66af2bc963e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4563796c-593a-466b-b341-26aa356dfbfb" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_5f819c9e-194f-40c5-8cf9-a66af2bc963e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/IntangibleAssetsNetDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#IntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/IntangibleAssetsNetDetails" xlink:type="extended" id="i52c0fd9b64fc408a8eed1a3a75879cc8_IntangibleAssetsNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_68e31e11-46b1-427f-b8b0-1fc5c6d6aa8b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_68e31e11-46b1-427f-b8b0-1fc5c6d6aa8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1453059e-51a8-406f-a899-205a2d862ffe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1453059e-51a8-406f-a899-205a2d862ffe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_d1601c3a-7175-4941-b0f6-934acf149e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_d1601c3a-7175-4941-b0f6-934acf149e3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_6d062db6-7476-4d5d-b03a-8050a7e66745" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_6d062db6-7476-4d5d-b03a-8050a7e66745" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_c5ab9796-459e-43fa-8271-461d8a06dc84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_b3b5bda2-bd3f-4ea8-b816-b5d188f91980" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_c5ab9796-459e-43fa-8271-461d8a06dc84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a586f6a0-be0a-405c-a20d-371bb9e4bf2e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_c5ab9796-459e-43fa-8271-461d8a06dc84" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a586f6a0-be0a-405c-a20d-371bb9e4bf2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a586f6a0-be0a-405c-a20d-371bb9e4bf2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a586f6a0-be0a-405c-a20d-371bb9e4bf2e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a586f6a0-be0a-405c-a20d-371bb9e4bf2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6ebc08c2-35e2-4f08-bfdb-590d9ac5dbbf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a586f6a0-be0a-405c-a20d-371bb9e4bf2e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6ebc08c2-35e2-4f08-bfdb-590d9ac5dbbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InternallyDevelopedFranchisesMember_761edd28-4144-486d-8f8d-14f8472985fa" xlink:href="atvi-20211231.xsd#atvi_InternallyDevelopedFranchisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6ebc08c2-35e2-4f08-bfdb-590d9ac5dbbf" xlink:to="loc_atvi_InternallyDevelopedFranchisesMember_761edd28-4144-486d-8f8d-14f8472985fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DevelopedSoftwareMember_4ccb3337-b784-4b16-aba4-1df1bd9f2628" xlink:href="atvi-20211231.xsd#atvi_DevelopedSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6ebc08c2-35e2-4f08-bfdb-590d9ac5dbbf" xlink:to="loc_atvi_DevelopedSoftwareMember_4ccb3337-b784-4b16-aba4-1df1bd9f2628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_8e6fb6f8-e01f-440e-b6bf-4250306b22af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6ebc08c2-35e2-4f08-bfdb-590d9ac5dbbf" xlink:to="loc_us-gaap_TradeNamesMember_8e6fb6f8-e01f-440e-b6bf-4250306b22af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_eae75ab8-a8a3-4404-9b93-1f98c62b8e84" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_c5ab9796-459e-43fa-8271-461d8a06dc84" xlink:to="loc_srt_RangeAxis_eae75ab8-a8a3-4404-9b93-1f98c62b8e84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_eae75ab8-a8a3-4404-9b93-1f98c62b8e84_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_eae75ab8-a8a3-4404-9b93-1f98c62b8e84" xlink:to="loc_srt_RangeMember_eae75ab8-a8a3-4404-9b93-1f98c62b8e84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2b44b2b9-93d8-47c8-a50c-5766d2160225" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_eae75ab8-a8a3-4404-9b93-1f98c62b8e84" xlink:to="loc_srt_RangeMember_2b44b2b9-93d8-47c8-a50c-5766d2160225" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_39028c4e-c3bc-43da-bacc-bd28700bd69b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2b44b2b9-93d8-47c8-a50c-5766d2160225" xlink:to="loc_srt_MinimumMember_39028c4e-c3bc-43da-bacc-bd28700bd69b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e9dc591f-df29-40c6-befc-1d09172a0cb4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2b44b2b9-93d8-47c8-a50c-5766d2160225" xlink:to="loc_srt_MaximumMember_e9dc591f-df29-40c6-befc-1d09172a0cb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_d8c36359-8915-4da8-a385-8fa5258d181b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5ac189a3-9597-43f1-a470-e7c395bb7eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_d8c36359-8915-4da8-a385-8fa5258d181b" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5ac189a3-9597-43f1-a470-e7c395bb7eaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_bdb949ac-3e25-477a-a9f7-519abb0f891f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_d8c36359-8915-4da8-a385-8fa5258d181b" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_bdb949ac-3e25-477a-a9f7-519abb0f891f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDeferredChargesAbstract_32bfd64d-e4f7-448a-a786-8d58c034fec5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfDeferredChargesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_d8c36359-8915-4da8-a385-8fa5258d181b" xlink:to="loc_us-gaap_AmortizationOfDeferredChargesAbstract_32bfd64d-e4f7-448a-a786-8d58c034fec5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_a0656a8f-4926-4258-940a-34fce5f483b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AmortizationOfDeferredChargesAbstract_32bfd64d-e4f7-448a-a786-8d58c034fec5" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_a0656a8f-4926-4258-940a-34fce5f483b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_6b7046ff-0e0d-4324-b351-fc6c699ffad2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems_d8c36359-8915-4da8-a385-8fa5258d181b" xlink:to="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_6b7046ff-0e0d-4324-b351-fc6c699ffad2" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_7c16c927-8488-4996-b1e5-1d228e5b6153" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTable_6b7046ff-0e0d-4324-b351-fc6c699ffad2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_7c16c927-8488-4996-b1e5-1d228e5b6153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_7c16c927-8488-4996-b1e5-1d228e5b6153_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_7c16c927-8488-4996-b1e5-1d228e5b6153" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_7c16c927-8488-4996-b1e5-1d228e5b6153_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_17f9c161-a925-4ce2-884e-4220ec9907fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_7c16c927-8488-4996-b1e5-1d228e5b6153" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_17f9c161-a925-4ce2-884e-4220ec9907fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_98f0e242-c5fb-4f0a-a8c1-f2704e57d1d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_17f9c161-a925-4ce2-884e-4220ec9907fc" xlink:to="loc_us-gaap_TrademarksMember_98f0e242-c5fb-4f0a-a8c1-f2704e57d1d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_5d03614d-22e6-47a2-b9bc-3877adc9ae99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_17f9c161-a925-4ce2-884e-4220ec9907fc" xlink:to="loc_us-gaap_TradeNamesMember_5d03614d-22e6-47a2-b9bc-3877adc9ae99" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/GoodwillDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#GoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/GoodwillDetails" xlink:type="extended" id="i470cb1a9268646fa8bd84fbcece238bb_GoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_9095be4b-fb7f-4707-8ac2-5dafe17e5652" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_413b708c-cd20-4260-9d21-eca5f0b3fed7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_9095be4b-fb7f-4707-8ac2-5dafe17e5652" xlink:to="loc_us-gaap_GoodwillRollForward_413b708c-cd20-4260-9d21-eca5f0b3fed7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_787b5dfa-ce07-41b8-83f3-131e0388a40d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_413b708c-cd20-4260-9d21-eca5f0b3fed7" xlink:to="loc_us-gaap_Goodwill_787b5dfa-ce07-41b8-83f3-131e0388a40d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_a86c85f9-195c-4217-8ff9-6ae1b3ffc7b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_413b708c-cd20-4260-9d21-eca5f0b3fed7" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_a86c85f9-195c-4217-8ff9-6ae1b3ffc7b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_7cb5bb60-0bf9-4d1b-a78b-813e744aa9df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_413b708c-cd20-4260-9d21-eca5f0b3fed7" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_7cb5bb60-0bf9-4d1b-a78b-813e744aa9df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_be55c5da-2d01-4b3e-935a-84187467c7d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_9d1507f3-02c5-4d49-89a8-c0c1413831f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_9095be4b-fb7f-4707-8ac2-5dafe17e5652" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_9d1507f3-02c5-4d49-89a8-c0c1413831f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6d99914b-aa96-4e76-a9e1-a2395c4b58a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_9d1507f3-02c5-4d49-89a8-c0c1413831f5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6d99914b-aa96-4e76-a9e1-a2395c4b58a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6d99914b-aa96-4e76-a9e1-a2395c4b58a8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6d99914b-aa96-4e76-a9e1-a2395c4b58a8" xlink:to="loc_us-gaap_SegmentDomain_6d99914b-aa96-4e76-a9e1-a2395c4b58a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a1ca1bf5-8f9e-4e01-97b9-2f2ea72d0458" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6d99914b-aa96-4e76-a9e1-a2395c4b58a8" xlink:to="loc_us-gaap_SegmentDomain_a1ca1bf5-8f9e-4e01-97b9-2f2ea72d0458" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ActivisionMember_195df676-e028-4522-954d-a4b85869306e" xlink:href="atvi-20211231.xsd#atvi_ActivisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a1ca1bf5-8f9e-4e01-97b9-2f2ea72d0458" xlink:to="loc_atvi_ActivisionMember_195df676-e028-4522-954d-a4b85869306e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BlizzardMember_b02bf5f7-6f82-4b98-a6c3-34c1fb210c30" xlink:href="atvi-20211231.xsd#atvi_BlizzardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a1ca1bf5-8f9e-4e01-97b9-2f2ea72d0458" xlink:to="loc_atvi_BlizzardMember_b02bf5f7-6f82-4b98-a6c3-34c1fb210c30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_KingDigitalEntertainmentMember_2a2dc9b6-414e-415f-ac56-1030d4bf6b9b" xlink:href="atvi-20211231.xsd#atvi_KingDigitalEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a1ca1bf5-8f9e-4e01-97b9-2f2ea72d0458" xlink:to="loc_atvi_KingDigitalEntertainmentMember_2a2dc9b6-414e-415f-ac56-1030d4bf6b9b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#FairValueMeasurementsRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsRecurringBasisDetails" xlink:type="extended" id="i0fb58940ca0d47458e651bd68e530da1_FairValueMeasurementsRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d3596e04-e284-4c67-a7b2-fd6e7cfa7807" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_bd78ef8c-7950-42fa-ae55-24b287818974" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d3596e04-e284-4c67-a7b2-fd6e7cfa7807" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_bd78ef8c-7950-42fa-ae55-24b287818974" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_2fe6ade1-9857-4a66-8b8e-cd35e4e85fe4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d3596e04-e284-4c67-a7b2-fd6e7cfa7807" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_2fe6ade1-9857-4a66-8b8e-cd35e4e85fe4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_d3596e04-e284-4c67-a7b2-fd6e7cfa7807" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ca95d1b8-f9db-4b82-954c-a8333a3c7bce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ca95d1b8-f9db-4b82-954c-a8333a3c7bce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_ca95d1b8-f9db-4b82-954c-a8333a3c7bce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ca95d1b8-f9db-4b82-954c-a8333a3c7bce" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_ca95d1b8-f9db-4b82-954c-a8333a3c7bce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_27e44ba3-32db-4126-ab53-8cf860d8f3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_ca95d1b8-f9db-4b82-954c-a8333a3c7bce" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_27e44ba3-32db-4126-ab53-8cf860d8f3f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_9f2619e5-503a-46a5-a94a-399799f771e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_27e44ba3-32db-4126-ab53-8cf860d8f3f7" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_9f2619e5-503a-46a5-a94a-399799f771e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_9ccec491-7121-4f5c-a67a-1aeef960b5f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_9ccec491-7121-4f5c-a67a-1aeef960b5f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9ccec491-7121-4f5c-a67a-1aeef960b5f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_9ccec491-7121-4f5c-a67a-1aeef960b5f9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9ccec491-7121-4f5c-a67a-1aeef960b5f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_14759e09-1015-4b51-9056-e5e4d988dea2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_9ccec491-7121-4f5c-a67a-1aeef960b5f9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_14759e09-1015-4b51-9056-e5e4d988dea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_108fed7c-6afc-49b7-896f-39d8ebc30d30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_14759e09-1015-4b51-9056-e5e4d988dea2" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_108fed7c-6afc-49b7-896f-39d8ebc30d30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_1a2e82cb-45f8-487d-bf44-2788c5ee520b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_14759e09-1015-4b51-9056-e5e4d988dea2" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_1a2e82cb-45f8-487d-bf44-2788c5ee520b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_0a15c24d-18de-4b9a-9b9c-4a00b4b8b8b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_14759e09-1015-4b51-9056-e5e4d988dea2" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_0a15c24d-18de-4b9a-9b9c-4a00b4b8b8b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_86b0ac06-49e3-48bd-b7f1-2dd51e88a596" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_86b0ac06-49e3-48bd-b7f1-2dd51e88a596" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_86b0ac06-49e3-48bd-b7f1-2dd51e88a596_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_86b0ac06-49e3-48bd-b7f1-2dd51e88a596" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_86b0ac06-49e3-48bd-b7f1-2dd51e88a596_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ba642703-0b4c-4600-b1db-13915a0b8274" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_86b0ac06-49e3-48bd-b7f1-2dd51e88a596" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ba642703-0b4c-4600-b1db-13915a0b8274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_9fb9fbad-677e-4558-977b-592a7421e05f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ba642703-0b4c-4600-b1db-13915a0b8274" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_9fb9fbad-677e-4558-977b-592a7421e05f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_61ce645a-9310-41ff-91fa-b59675df51d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ba642703-0b4c-4600-b1db-13915a0b8274" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_61ce645a-9310-41ff-91fa-b59675df51d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_14892701-666b-49fb-a112-88e48e9f60f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ba642703-0b4c-4600-b1db-13915a0b8274" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_14892701-666b-49fb-a112-88e48e9f60f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_54474855-ea0e-4f4a-976f-4d88253e1dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:to="loc_us-gaap_InvestmentTypeAxis_54474855-ea0e-4f4a-976f-4d88253e1dd5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_54474855-ea0e-4f4a-976f-4d88253e1dd5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_54474855-ea0e-4f4a-976f-4d88253e1dd5" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_54474855-ea0e-4f4a-976f-4d88253e1dd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_54474855-ea0e-4f4a-976f-4d88253e1dd5" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_76af975a-5974-420f-ac1e-30204868cd4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:to="loc_us-gaap_MoneyMarketFundsMember_76af975a-5974-420f-ac1e-30204868cd4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ForeignGovernmentTreasuryBillsMember_ce06eca4-f481-4ca4-8ccb-7022233c8808" xlink:href="atvi-20211231.xsd#atvi_ForeignGovernmentTreasuryBillsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:to="loc_atvi_ForeignGovernmentTreasuryBillsMember_ce06eca4-f481-4ca4-8ccb-7022233c8808" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember_6ee942ae-63dd-4321-9e54-bf86de1e21b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:to="loc_us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember_6ee942ae-63dd-4321-9e54-bf86de1e21b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_9aa5991f-8ef1-49d1-8c98-36d0991b4bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:to="loc_us-gaap_EquitySecuritiesMember_9aa5991f-8ef1-49d1-8c98-36d0991b4bd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_8e55c9eb-e0ba-473a-bbf5-f7ec6796ec08" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_666808fe-9cca-42d5-ac9a-a04962f80f32" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_8e55c9eb-e0ba-473a-bbf5-f7ec6796ec08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_cbbb2889-1728-4753-a801-59739beb17b1" xlink:to="loc_us-gaap_HedgingDesignationAxis_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8" xlink:to="loc_us-gaap_HedgingDesignationDomain_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_234a5b46-05b8-48b5-99a8-2147c656f698" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_d27fbabb-1b2d-4e2d-aae4-b4e54f38e7c8" xlink:to="loc_us-gaap_HedgingDesignationDomain_234a5b46-05b8-48b5-99a8-2147c656f698" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_d3bd2cde-17bb-4a5f-b9c7-dbd8f3b2fb49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_234a5b46-05b8-48b5-99a8-2147c656f698" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_d3bd2cde-17bb-4a5f-b9c7-dbd8f3b2fb49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_82969a0d-dbf6-4808-89b2-e86e225c5d24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_234a5b46-05b8-48b5-99a8-2147c656f698" xlink:to="loc_us-gaap_NondesignatedMember_82969a0d-dbf6-4808-89b2-e86e225c5d24" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsForeignCurrencyForwardContractsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#FairValueMeasurementsForeignCurrencyForwardContractsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsForeignCurrencyForwardContractsDetails" xlink:type="extended" id="ib36bb8cf43ae474993bfdd7db1cc6312_FairValueMeasurementsForeignCurrencyForwardContractsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_97034fe6-0d64-4362-992f-edb8250665a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeRemainingMaturity1_f22ba80f-69e2-4859-911b-e55717273dba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeRemainingMaturity1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_97034fe6-0d64-4362-992f-edb8250665a7" xlink:to="loc_us-gaap_DerivativeRemainingMaturity1_f22ba80f-69e2-4859-911b-e55717273dba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_3ebaa56e-9c2d-42c3-b3b7-ab7bb47ad2b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_97034fe6-0d64-4362-992f-edb8250665a7" xlink:to="loc_us-gaap_DerivativeNotionalAmount_3ebaa56e-9c2d-42c3-b3b7-ab7bb47ad2b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_cea67504-e62c-4361-9bed-3ed91585199c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_97034fe6-0d64-4362-992f-edb8250665a7" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_cea67504-e62c-4361-9bed-3ed91585199c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_2f9ff6a7-70eb-4ea4-8249-72c353482fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_97034fe6-0d64-4362-992f-edb8250665a7" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_2f9ff6a7-70eb-4ea4-8249-72c353482fe2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_5d9bf98d-2e59-431b-9996-79ac021b2559" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_2f9ff6a7-70eb-4ea4-8249-72c353482fe2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_5d9bf98d-2e59-431b-9996-79ac021b2559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_5d9bf98d-2e59-431b-9996-79ac021b2559_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_5d9bf98d-2e59-431b-9996-79ac021b2559" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_5d9bf98d-2e59-431b-9996-79ac021b2559_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4c05e68a-6e17-437c-954b-316af8650327" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_5d9bf98d-2e59-431b-9996-79ac021b2559" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4c05e68a-6e17-437c-954b-316af8650327" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_2eaa6931-e633-4ef4-9653-6597beb8c1a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_4c05e68a-6e17-437c-954b-316af8650327" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_2eaa6931-e633-4ef4-9653-6597beb8c1a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BuyUSDSellEURMember_6319fa7c-4402-4643-a334-b55c2a543ef6" xlink:href="atvi-20211231.xsd#atvi_BuyUSDSellEURMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_4c05e68a-6e17-437c-954b-316af8650327" xlink:to="loc_atvi_BuyUSDSellEURMember_6319fa7c-4402-4643-a334-b55c2a543ef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BuyUSDSellGBPMember_f7e8a1af-4af0-4a4e-829a-0f11a15ce1de" xlink:href="atvi-20211231.xsd#atvi_BuyUSDSellGBPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_4c05e68a-6e17-437c-954b-316af8650327" xlink:to="loc_atvi_BuyUSDSellGBPMember_f7e8a1af-4af0-4a4e-829a-0f11a15ce1de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_f2802dea-6c6d-4e25-84db-54fad5aa66bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_2f9ff6a7-70eb-4ea4-8249-72c353482fe2" xlink:to="loc_us-gaap_HedgingDesignationAxis_f2802dea-6c6d-4e25-84db-54fad5aa66bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_f2802dea-6c6d-4e25-84db-54fad5aa66bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_f2802dea-6c6d-4e25-84db-54fad5aa66bb" xlink:to="loc_us-gaap_HedgingDesignationDomain_f2802dea-6c6d-4e25-84db-54fad5aa66bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_c195640c-69fd-4f62-b37a-7c2fdab2e0ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_f2802dea-6c6d-4e25-84db-54fad5aa66bb" xlink:to="loc_us-gaap_HedgingDesignationDomain_c195640c-69fd-4f62-b37a-7c2fdab2e0ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_df360a05-06e1-4707-9c2e-c0c2c9058e08" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_c195640c-69fd-4f62-b37a-7c2fdab2e0ca" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_df360a05-06e1-4707-9c2e-c0c2c9058e08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_2cf1c4b1-a8e0-418f-a44d-1442c079a31b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_c195640c-69fd-4f62-b37a-7c2fdab2e0ca" xlink:to="loc_us-gaap_NondesignatedMember_2cf1c4b1-a8e0-418f-a44d-1442c079a31b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_52b8b813-3d6b-46af-81cb-0692d1682e35" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_2f9ff6a7-70eb-4ea4-8249-72c353482fe2" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_52b8b813-3d6b-46af-81cb-0692d1682e35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_52b8b813-3d6b-46af-81cb-0692d1682e35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_52b8b813-3d6b-46af-81cb-0692d1682e35" xlink:to="loc_us-gaap_HedgingRelationshipDomain_52b8b813-3d6b-46af-81cb-0692d1682e35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_2a7c0005-cd26-4f63-883e-8cbedab32e37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_52b8b813-3d6b-46af-81cb-0692d1682e35" xlink:to="loc_us-gaap_HedgingRelationshipDomain_2a7c0005-cd26-4f63-883e-8cbedab32e37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_dffc82cf-45ee-4095-8e41-e007d8d606db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_2a7c0005-cd26-4f63-883e-8cbedab32e37" xlink:to="loc_us-gaap_CashFlowHedgingMember_dffc82cf-45ee-4095-8e41-e007d8d606db" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/FairValueMeasurementsNonRecurringBasisDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#FairValueMeasurementsNonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/FairValueMeasurementsNonRecurringBasisDetails" xlink:type="extended" id="i7fc095ff4fff4d17b5dcac33e68b540d_FairValueMeasurementsNonRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_1d8ef173-2bec-43ec-a35e-82dbc95e201b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_1d8ef173-2bec-43ec-a35e-82dbc95e201b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi_9edb571e-1a13-4793-88e0-7ae5920745cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquitySecuritiesFvNi_9edb571e-1a13-4793-88e0-7ae5920745cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_a4060411-83d1-4688-ac32-ed69531e6965" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNiRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:to="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_a4060411-83d1-4688-ac32-ed69531e6965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_5d9d36ef-d29b-4038-b493-59aa73ca8390" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_5d9d36ef-d29b-4038-b493-59aa73ca8390" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e42d2319-9cba-4c73-9181-0c51000978a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_21650e8a-97a3-448b-8fc3-b7a67c8a5a15" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e42d2319-9cba-4c73-9181-0c51000978a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_717c417d-2b28-4da8-8e65-2e01716e33e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e42d2319-9cba-4c73-9181-0c51000978a8" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_717c417d-2b28-4da8-8e65-2e01716e33e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_717c417d-2b28-4da8-8e65-2e01716e33e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_717c417d-2b28-4da8-8e65-2e01716e33e7" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_717c417d-2b28-4da8-8e65-2e01716e33e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_78bb50e9-c2e2-4265-a2d1-ec72f0a24593" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_717c417d-2b28-4da8-8e65-2e01716e33e7" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_78bb50e9-c2e2-4265-a2d1-ec72f0a24593" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_45376b11-e580-4824-b54e-e52550d4edc4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_78bb50e9-c2e2-4265-a2d1-ec72f0a24593" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_45376b11-e580-4824-b54e-e52550d4edc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f8c5472d-50ed-476d-b11f-47a89b44988d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e42d2319-9cba-4c73-9181-0c51000978a8" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f8c5472d-50ed-476d-b11f-47a89b44988d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_f8c5472d-50ed-476d-b11f-47a89b44988d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f8c5472d-50ed-476d-b11f-47a89b44988d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_f8c5472d-50ed-476d-b11f-47a89b44988d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9da73178-2993-4d3b-bb6b-3f632da90e1e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f8c5472d-50ed-476d-b11f-47a89b44988d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9da73178-2993-4d3b-bb6b-3f632da90e1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1c169e8b-91dc-4785-b5ea-7260310f2be2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_9da73178-2993-4d3b-bb6b-3f632da90e1e" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_1c169e8b-91dc-4785-b5ea-7260310f2be2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_337faa34-dec9-4005-bbf9-fdaf8cf69fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e42d2319-9cba-4c73-9181-0c51000978a8" xlink:to="loc_us-gaap_InvestmentTypeAxis_337faa34-dec9-4005-bbf9-fdaf8cf69fe9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_337faa34-dec9-4005-bbf9-fdaf8cf69fe9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_337faa34-dec9-4005-bbf9-fdaf8cf69fe9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_337faa34-dec9-4005-bbf9-fdaf8cf69fe9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_f86721b7-1044-4c4b-a956-27ae6f54aad9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_337faa34-dec9-4005-bbf9-fdaf8cf69fe9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_f86721b7-1044-4c4b-a956-27ae6f54aad9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_fcdfd51f-ebc4-47e9-9bd3-794b860cd989" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_f86721b7-1044-4c4b-a956-27ae6f54aad9" xlink:to="loc_us-gaap_EquitySecuritiesMember_fcdfd51f-ebc4-47e9-9bd3-794b860cd989" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#DeferredRevenuesRemainingPerformanceObligationDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails" xlink:type="extended" id="i9f79bed4aeb149d6b6f03ca2b2fdf62b_DeferredRevenuesRemainingPerformanceObligationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_423d0977-86cb-4df3-86ce-dd13957ddce1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_423d0977-86cb-4df3-86ce-dd13957ddce1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bc2e5971-8d6a-44ae-921a-e1f016037103" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bc2e5971-8d6a-44ae-921a-e1f016037103" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_cc97c7ba-dab2-4ed9-96c8-8f71696eb494" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bc2e5971-8d6a-44ae-921a-e1f016037103" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_cc97c7ba-dab2-4ed9-96c8-8f71696eb494" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails_1" xlink:type="simple" xlink:href="atvi-20211231.xsd#DeferredRevenuesRemainingPerformanceObligationDetails_1"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/DeferredRevenuesRemainingPerformanceObligationDetails_1" xlink:type="extended" id="ia3b77c164cad4e3eb0adccf8fe240735_DeferredRevenuesRemainingPerformanceObligationDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_423d0977-86cb-4df3-86ce-dd13957ddce1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_423d0977-86cb-4df3-86ce-dd13957ddce1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bc2e5971-8d6a-44ae-921a-e1f016037103" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ced666f2-d5dd-4210-93ab-9aa8af8b3215" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_bc2e5971-8d6a-44ae-921a-e1f016037103" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/LeasesNarrativeDetails" xlink:type="extended" id="i1dbe637f1dce4858acecb361d4c372d7_LeasesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_d4dff3a8-d4a7-407c-b3d2-798f7a6c71c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_75f383ec-9e94-4c64-a497-f7ddcf6b9941" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_d4dff3a8-d4a7-407c-b3d2-798f7a6c71c4" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_75f383ec-9e94-4c64-a497-f7ddcf6b9941" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_80791066-519e-45c0-bee2-a9a487551bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_d4dff3a8-d4a7-407c-b3d2-798f7a6c71c4" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_80791066-519e-45c0-bee2-a9a487551bf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_a1723fad-8109-44c1-a8c1-bf8c65b5466c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_d4dff3a8-d4a7-407c-b3d2-798f7a6c71c4" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_a1723fad-8109-44c1-a8c1-bf8c65b5466c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_790c2903-2dec-4e9b-b28e-9ce588e6e9dc" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_a1723fad-8109-44c1-a8c1-bf8c65b5466c" xlink:to="loc_srt_RangeAxis_790c2903-2dec-4e9b-b28e-9ce588e6e9dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_790c2903-2dec-4e9b-b28e-9ce588e6e9dc_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_790c2903-2dec-4e9b-b28e-9ce588e6e9dc" xlink:to="loc_srt_RangeMember_790c2903-2dec-4e9b-b28e-9ce588e6e9dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3396905f-af80-4f4e-b180-dc3945c7f0a5" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_790c2903-2dec-4e9b-b28e-9ce588e6e9dc" xlink:to="loc_srt_RangeMember_3396905f-af80-4f4e-b180-dc3945c7f0a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1751ca7c-a1cb-48c7-8cc5-cfefdd67180c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3396905f-af80-4f4e-b180-dc3945c7f0a5" xlink:to="loc_srt_MinimumMember_1751ca7c-a1cb-48c7-8cc5-cfefdd67180c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_dd3b6692-f6a5-45c6-acb7-3cd0ef5268f3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3396905f-af80-4f4e-b180-dc3945c7f0a5" xlink:to="loc_srt_MaximumMember_dd3b6692-f6a5-45c6-acb7-3cd0ef5268f3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/DebtCreditFacilitiesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#DebtCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtCreditFacilitiesDetails" xlink:type="extended" id="iec2433a054c4463ab346824c1960525c_DebtCreditFacilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2b11b8d3-b278-482a-8db7-e48065bba4b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2b11b8d3-b278-482a-8db7-e48065bba4b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_a4260cb1-d097-4daa-acd1-6111fcb120ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_LineOfCredit_a4260cb1-d097-4daa-acd1-6111fcb120ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DebtInstrumentBaseRateMargin_62bfea69-1856-4908-a14c-d5e03ed99b2e" xlink:href="atvi-20211231.xsd#atvi_DebtInstrumentBaseRateMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_DebtInstrumentBaseRateMargin_62bfea69-1856-4908-a14c-d5e03ed99b2e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DebtInstrumentVariableRateInterestFloor_6cc45b63-9af5-4bbc-9c01-926a552b3e01" xlink:href="atvi-20211231.xsd#atvi_DebtInstrumentVariableRateInterestFloor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_DebtInstrumentVariableRateInterestFloor_6cc45b63-9af5-4bbc-9c01-926a552b3e01" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9e9d9011-ceaf-4fbe-9f4a-4e83d2639b40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9e9d9011-ceaf-4fbe-9f4a-4e83d2639b40" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_AvailabilityForLettersOfCredit_9168140e-d22f-423e-98ab-0a7c8e15d2bb" xlink:href="atvi-20211231.xsd#atvi_AvailabilityForLettersOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_AvailabilityForLettersOfCredit_9168140e-d22f-423e-98ab-0a7c8e15d2bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum_63106253-98db-42dd-b73a-b92e6003c3c0" xlink:href="atvi-20211231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioMaximum_63106253-98db-42dd-b73a-b92e6003c3c0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition_3f440de4-62af-4429-9f6c-c8a633c91a59" xlink:href="atvi-20211231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalNetDebtRatioQualifyingAcquisition_3f440de4-62af-4429-9f6c-c8a633c91a59" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum_7fa613ee-515b-4e0c-9b13-e7d6743026e0" xlink:href="atvi-20211231.xsd#atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_atvi_DebtInstrumentCovenantConsolidatedTotalAssetsRatioMaximum_7fa613ee-515b-4e0c-9b13-e7d6743026e0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_82795071-8aa3-41b9-982d-17e3adebb127" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_82795071-8aa3-41b9-982d-17e3adebb127" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_92a7edeb-b24d-4eed-a3cf-327a39facfc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_92a7edeb-b24d-4eed-a3cf-327a39facfc0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e51e6550-7c30-4d24-9b93-95a6859872e0" xlink:to="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_c250bc2e-6864-41c4-b148-e4cdbcedd7c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_us-gaap_CreditFacilityAxis_c250bc2e-6864-41c4-b148-e4cdbcedd7c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c250bc2e-6864-41c4-b148-e4cdbcedd7c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_c250bc2e-6864-41c4-b148-e4cdbcedd7c2" xlink:to="loc_us-gaap_CreditFacilityDomain_c250bc2e-6864-41c4-b148-e4cdbcedd7c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_831264a5-7b17-4a81-aef3-90163bfb0a04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_c250bc2e-6864-41c4-b148-e4cdbcedd7c2" xlink:to="loc_us-gaap_CreditFacilityDomain_831264a5-7b17-4a81-aef3-90163bfb0a04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_8fbc2948-699d-4851-adde-6ae25747fe2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_831264a5-7b17-4a81-aef3-90163bfb0a04" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_8fbc2948-699d-4851-adde-6ae25747fe2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e45e2b71-9ed3-4f78-89d4-6919e1193fca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_62b94ff3-8f91-4ed2-bb92-2ce40b6d8a6b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e45e2b71-9ed3-4f78-89d4-6919e1193fca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_03c3276e-c505-4577-b5cc-da65bfbaa54a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e45e2b71-9ed3-4f78-89d4-6919e1193fca" xlink:to="loc_us-gaap_LineOfCreditMember_03c3276e-c505-4577-b5cc-da65bfbaa54a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_ad552446-099b-493a-87ce-19b9677f95fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e45e2b71-9ed3-4f78-89d4-6919e1193fca" xlink:to="loc_us-gaap_UnsecuredDebtMember_ad552446-099b-493a-87ce-19b9677f95fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_3aa75029-2e96-43c0-99d6-7071e4e1bcf2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_us-gaap_DebtInstrumentAxis_3aa75029-2e96-43c0-99d6-7071e4e1bcf2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3aa75029-2e96-43c0-99d6-7071e4e1bcf2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3aa75029-2e96-43c0-99d6-7071e4e1bcf2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3aa75029-2e96-43c0-99d6-7071e4e1bcf2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fcc503ad-ba72-4a17-8dfb-b6fe7fb373d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3aa75029-2e96-43c0-99d6-7071e4e1bcf2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fcc503ad-ba72-4a17-8dfb-b6fe7fb373d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CreditAgreementasAmendedMember_d76705f3-1b06-476f-9c4b-834278c8cd03" xlink:href="atvi-20211231.xsd#atvi_CreditAgreementasAmendedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fcc503ad-ba72-4a17-8dfb-b6fe7fb373d6" xlink:to="loc_atvi_CreditAgreementasAmendedMember_d76705f3-1b06-476f-9c4b-834278c8cd03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_TheNotesMember_7736600d-8a72-43e1-bc69-863e7878da72" xlink:href="atvi-20211231.xsd#atvi_TheNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fcc503ad-ba72-4a17-8dfb-b6fe7fb373d6" xlink:to="loc_atvi_TheNotesMember_7736600d-8a72-43e1-bc69-863e7878da72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_us-gaap_VariableRateAxis_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1" xlink:to="loc_us-gaap_VariableRateDomain_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_c1ecbb13-5aa3-4b0a-93ae-fd6fab77703e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_a5080fbc-026e-4d38-a4b2-919d2b8c8cc1" xlink:to="loc_us-gaap_VariableRateDomain_c1ecbb13-5aa3-4b0a-93ae-fd6fab77703e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_a3012ddc-0a8e-4a0a-9efc-ad45dc1bd547" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_c1ecbb13-5aa3-4b0a-93ae-fd6fab77703e" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_a3012ddc-0a8e-4a0a-9efc-ad45dc1bd547" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_90a0fd17-ca1d-4ba5-8d67-6de8624bd531" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_c1ecbb13-5aa3-4b0a-93ae-fd6fab77703e" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_90a0fd17-ca1d-4ba5-8d67-6de8624bd531" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_246c5bff-b785-4c28-b4ce-0aa83eac2479" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_c1ecbb13-5aa3-4b0a-93ae-fd6fab77703e" xlink:to="loc_us-gaap_BaseRateMember_246c5bff-b785-4c28-b4ce-0aa83eac2479" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a455a864-5f65-4216-bf4a-b3decd78c486" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_srt_RangeAxis_a455a864-5f65-4216-bf4a-b3decd78c486" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a455a864-5f65-4216-bf4a-b3decd78c486_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_a455a864-5f65-4216-bf4a-b3decd78c486" xlink:to="loc_srt_RangeMember_a455a864-5f65-4216-bf4a-b3decd78c486_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_955d2c7c-1a60-4763-bc9e-dfe3aa95f2f7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_a455a864-5f65-4216-bf4a-b3decd78c486" xlink:to="loc_srt_RangeMember_955d2c7c-1a60-4763-bc9e-dfe3aa95f2f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c8d408cc-c623-471b-993d-05797552701e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_955d2c7c-1a60-4763-bc9e-dfe3aa95f2f7" xlink:to="loc_srt_MinimumMember_c8d408cc-c623-471b-993d-05797552701e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3ab4e29f-4658-4ee5-8105-579a61b40df0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_955d2c7c-1a60-4763-bc9e-dfe3aa95f2f7" xlink:to="loc_srt_MaximumMember_3ab4e29f-4658-4ee5-8105-579a61b40df0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8f4f16ee-ba77-4a28-bc72-5121f27cbb75" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79905f64-0ee7-433b-9c8c-2a18dc969247" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8f4f16ee-ba77-4a28-bc72-5121f27cbb75" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8f4f16ee-ba77-4a28-bc72-5121f27cbb75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8f4f16ee-ba77-4a28-bc72-5121f27cbb75" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8f4f16ee-ba77-4a28-bc72-5121f27cbb75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_e4e7ab11-0de7-4415-a2ed-4bb00f36f7ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8f4f16ee-ba77-4a28-bc72-5121f27cbb75" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_e4e7ab11-0de7-4415-a2ed-4bb00f36f7ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_06b7c8eb-809e-4973-a8be-177248fd41c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_e4e7ab11-0de7-4415-a2ed-4bb00f36f7ad" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_06b7c8eb-809e-4973-a8be-177248fd41c5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/DebtSummaryofDebtDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#DebtSummaryofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/DebtSummaryofDebtDetails" xlink:type="extended" id="ieb7c3a691e634772a6bbc36754deca73_DebtSummaryofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_9f1c7c4c-1a48-4a3e-9de3-554be6906a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_9f1c7c4c-1a48-4a3e-9de3-554be6906a4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_88cf6c4a-958c-4db7-8d7a-eb0c6ce3758c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_88cf6c4a-958c-4db7-8d7a-eb0c6ce3758c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_00f2a786-82ab-44b7-9225-d1359ad5d307" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_00f2a786-82ab-44b7-9225-d1359ad5d307" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_9aee994a-04f9-4196-8f93-a3b478544046" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_LongTermDebt_9aee994a-04f9-4196-8f93-a3b478544046" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_1cfcc940-415c-4156-8440-b07e10444ebd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_LongTermDebtFairValue_1cfcc940-415c-4156-8440-b07e10444ebd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_83a60572-ef1a-4e67-847a-db86c8468610" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_94e3c372-2731-4824-8629-28ddce50078d" xlink:to="loc_us-gaap_DebtInstrumentTable_83a60572-ef1a-4e67-847a-db86c8468610" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_ac5f5a81-5700-4e98-a300-67c7e64bf200" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_83a60572-ef1a-4e67-847a-db86c8468610" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_ac5f5a81-5700-4e98-a300-67c7e64bf200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ac5f5a81-5700-4e98-a300-67c7e64bf200_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ac5f5a81-5700-4e98-a300-67c7e64bf200" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ac5f5a81-5700-4e98-a300-67c7e64bf200_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e551a272-5244-41b2-8865-41482069eb6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_ac5f5a81-5700-4e98-a300-67c7e64bf200" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e551a272-5244-41b2-8865-41482069eb6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_a8a8f808-9934-4783-a29a-06ce24b14294" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_e551a272-5244-41b2-8865-41482069eb6c" xlink:to="loc_us-gaap_UnsecuredDebtMember_a8a8f808-9934-4783-a29a-06ce24b14294" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a8c56b39-52b7-43e5-9f4c-b099eee997de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_83a60572-ef1a-4e67-847a-db86c8468610" xlink:to="loc_us-gaap_DebtInstrumentAxis_a8c56b39-52b7-43e5-9f4c-b099eee997de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a8c56b39-52b7-43e5-9f4c-b099eee997de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a8c56b39-52b7-43e5-9f4c-b099eee997de" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a8c56b39-52b7-43e5-9f4c-b099eee997de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a8c56b39-52b7-43e5-9f4c-b099eee997de" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_Unsecured2026NotesMember_0acca360-7c49-4948-8dd2-baef84c6d943" xlink:href="atvi-20211231.xsd#atvi_Unsecured2026NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:to="loc_atvi_Unsecured2026NotesMember_0acca360-7c49-4948-8dd2-baef84c6d943" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_Unsecured2027NotesMember_9d605919-afdf-49bc-9b52-5cc1447ef7fe" xlink:href="atvi-20211231.xsd#atvi_Unsecured2027NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:to="loc_atvi_Unsecured2027NotesMember_9d605919-afdf-49bc-9b52-5cc1447ef7fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_Unsecured2030NotesMember_6d7c5ba1-8cdd-42e5-82b3-a66ec3b64d8e" xlink:href="atvi-20211231.xsd#atvi_Unsecured2030NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:to="loc_atvi_Unsecured2030NotesMember_6d7c5ba1-8cdd-42e5-82b3-a66ec3b64d8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_Unsecured2047NotesMember_2e3d2039-fdc4-4baf-8949-42934d862bc5" xlink:href="atvi-20211231.xsd#atvi_Unsecured2047NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:to="loc_atvi_Unsecured2047NotesMember_2e3d2039-fdc4-4baf-8949-42934d862bc5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_Unsecured2050NotesMember_794a1045-4ab6-4d6b-ad79-2fd91885f07f" xlink:href="atvi-20211231.xsd#atvi_Unsecured2050NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_77b35292-7253-4f7a-8895-f3b758c454e4" xlink:to="loc_atvi_Unsecured2050NotesMember_794a1045-4ab6-4d6b-ad79-2fd91885f07f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bc77bec8-4975-459b-86c7-e18d8142165b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_83a60572-ef1a-4e67-847a-db86c8468610" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bc77bec8-4975-459b-86c7-e18d8142165b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bc77bec8-4975-459b-86c7-e18d8142165b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bc77bec8-4975-459b-86c7-e18d8142165b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bc77bec8-4975-459b-86c7-e18d8142165b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c872f389-f2f4-4819-b7a7-283d2fd3dd56" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bc77bec8-4975-459b-86c7-e18d8142165b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c872f389-f2f4-4819-b7a7-283d2fd3dd56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_793a6d96-985a-4a57-bf41-5a575c75a215" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c872f389-f2f4-4819-b7a7-283d2fd3dd56" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_793a6d96-985a-4a57-bf41-5a575c75a215" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#AccumulatedOtherComprehensiveIncomeLossComponentsofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/AccumulatedOtherComprehensiveIncomeLossComponentsofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended" id="i7790ea6366cf47d587258d9a6a132a94_AccumulatedOtherComprehensiveIncomeLossComponentsofAccumulatedOtherComprehensiveIncomeLossDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d1b7eb74-5b38-4885-9bfd-3867ae4af883" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_6279c779-3983-4adf-bc4b-1c8a350a75a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d1b7eb74-5b38-4885-9bfd-3867ae4af883" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_6279c779-3983-4adf-bc4b-1c8a350a75a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_3f7efb2b-7ad4-445c-9f5b-20f56fe90c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_6279c779-3983-4adf-bc4b-1c8a350a75a9" xlink:to="loc_us-gaap_StockholdersEquity_3f7efb2b-7ad4-445c-9f5b-20f56fe90c7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_b4a0bd73-383a-4d24-97a5-41abf32907b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_6279c779-3983-4adf-bc4b-1c8a350a75a9" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_b4a0bd73-383a-4d24-97a5-41abf32907b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_106c20c6-90d0-4079-9aec-fcf127f346ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_6279c779-3983-4adf-bc4b-1c8a350a75a9" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_106c20c6-90d0-4079-9aec-fcf127f346ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8d721394-5c98-4377-835b-d29d91ad0e3c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0436fcf6-2ad3-4578-9257-2057a6ee639f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_d1b7eb74-5b38-4885-9bfd-3867ae4af883" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0436fcf6-2ad3-4578-9257-2057a6ee639f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_c89e0011-1dfb-446d-845b-543170baf87d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_0436fcf6-2ad3-4578-9257-2057a6ee639f" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_c89e0011-1dfb-446d-845b-543170baf87d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c89e0011-1dfb-446d-845b-543170baf87d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c89e0011-1dfb-446d-845b-543170baf87d" xlink:to="loc_us-gaap_EquityComponentDomain_c89e0011-1dfb-446d-845b-543170baf87d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c89e0011-1dfb-446d-845b-543170baf87d" xlink:to="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_d6f33226-b455-48c0-b2ec-ed7d25b7a7b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_d6f33226-b455-48c0-b2ec-ed7d25b7a7b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_df3fa88f-8b76-4208-a27f-7bb43d3672be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_df3fa88f-8b76-4208-a27f-7bb43d3672be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_3e017848-d8d2-4410-a2e2-04c7b0e2433e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_3e017848-d8d2-4410-a2e2-04c7b0e2433e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1f739cab-6e72-4d80-8208-605605d7e226" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_339ad044-68c1-45a6-bd5e-01cb2b444e7b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1f739cab-6e72-4d80-8208-605605d7e226" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/OperatingSegmentsandGeographicRegionsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#OperatingSegmentsandGeographicRegionsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/OperatingSegmentsandGeographicRegionsDetails" xlink:type="extended" id="i524c9849cc0e4c19a50d1424f69692c9_OperatingSegmentsandGeographicRegionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_e301c4eb-0fdd-4b34-8c44-2aab40adc8e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_NumberOfReportableSegments_e301c4eb-0fdd-4b34-8c44-2aab40adc8e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_70b03a29-a099-4a6c-aa3e-6d5918685e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_70b03a29-a099-4a6c-aa3e-6d5918685e8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_SegmentRevenues_e88680dc-8e81-4cd5-a5bf-8866a64e38a3" xlink:href="atvi-20211231.xsd#atvi_SegmentRevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_atvi_SegmentRevenues_e88680dc-8e81-4cd5-a5bf-8866a64e38a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_ba525257-458e-49a1-85c6-38a6e6ccb9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_OperatingIncomeLoss_ba525257-458e-49a1-85c6-38a6e6ccb9a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact_ce8d9d2f-4a99-40b9-a5e3-a654eb37adbd" xlink:href="atvi-20211231.xsd#atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesRevenueImpact_ce8d9d2f-4a99-40b9-a5e3-a654eb37adbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_216fa1dc-8c8e-4f9e-b6a7-9cb037c02f04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_216fa1dc-8c8e-4f9e-b6a7-9cb037c02f04" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact_05291b88-58a2-4aac-ac2f-3826e5481cfe" xlink:href="atvi-20211231.xsd#atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_atvi_DeferralOfNetRevenuesAndRelatedCostOfSalesOperatingIncomeImpact_05291b88-58a2-4aac-ac2f-3826e5481cfe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_d4786311-67f5-4801-a32c-4668f3766354" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_d4786311-67f5-4801-a32c-4668f3766354" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_83fc3fe4-633b-4292-99f0-7dd5454654b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_83fc3fe4-633b-4292-99f0-7dd5454654b5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_3c9070c4-26d2-47f2-91de-2a2d97af1cb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_RestructuringCharges_3c9070c4-26d2-47f2-91de-2a2d97af1cb1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DiscreteTaxRelatedItems_db0e66b3-2f76-443d-9e92-38090d5a5f57" xlink:href="atvi-20211231.xsd#atvi_DiscreteTaxRelatedItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_atvi_DiscreteTaxRelatedItems_db0e66b3-2f76-443d-9e92-38090d5a5f57" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_86a09b0a-168d-4ffe-a702-efbcafa445af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_86a09b0a-168d-4ffe-a702-efbcafa445af" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_5c6f7a8e-c321-4c8a-aa8b-ab85a0a65f8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_5c6f7a8e-c321-4c8a-aa8b-ab85a0a65f8d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5abdbd96-8e3f-45ae-8593-dc66570f7f97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5abdbd96-8e3f-45ae-8593-dc66570f7f97" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_97c5c44a-c6cd-48bd-a999-ff3b035e0515" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_97c5c44a-c6cd-48bd-a999-ff3b035e0515" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_79bd5ca5-0eed-4131-b964-e98f3502af0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_NoncurrentAssets_79bd5ca5-0eed-4131-b964-e98f3502af0b" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3e462b2d-00ec-41aa-a7f3-19668edaee7f" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_1ea65dec-fb7b-432e-b129-3f46a0faa618" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_srt_ConsolidationItemsAxis_1ea65dec-fb7b-432e-b129-3f46a0faa618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_1ea65dec-fb7b-432e-b129-3f46a0faa618_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_1ea65dec-fb7b-432e-b129-3f46a0faa618" xlink:to="loc_srt_ConsolidationItemsDomain_1ea65dec-fb7b-432e-b129-3f46a0faa618_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_1ea65dec-fb7b-432e-b129-3f46a0faa618" xlink:to="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_a70fbe1b-be0b-444e-9248-d62c266e8e17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:to="loc_us-gaap_OperatingSegmentsMember_a70fbe1b-be0b-444e-9248-d62c266e8e17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_57c9563c-a9b6-445b-9bbb-316ec1673606" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:to="loc_us-gaap_CorporateNonSegmentMember_57c9563c-a9b6-445b-9bbb-316ec1673606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_9d8ddfb6-6cff-49f0-8008-4719a48923dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_9d8ddfb6-6cff-49f0-8008-4719a48923dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_c25a27aa-093b-45ee-8a45-262f9b3f4f26" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_3a59da06-ba86-4cae-ad1c-b03b552907cf" xlink:to="loc_us-gaap_IntersegmentEliminationMember_c25a27aa-093b-45ee-8a45-262f9b3f4f26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed" xlink:to="loc_us-gaap_SegmentDomain_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a5ff0b37-d0c1-489d-b93c-e33c9f2701ed" xlink:to="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ActivisionMember_9005448b-289d-48a5-a59c-22478673d4bd" xlink:href="atvi-20211231.xsd#atvi_ActivisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:to="loc_atvi_ActivisionMember_9005448b-289d-48a5-a59c-22478673d4bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BlizzardMember_8cb433ad-d311-4e67-991a-ad5f01876af9" xlink:href="atvi-20211231.xsd#atvi_BlizzardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:to="loc_atvi_BlizzardMember_8cb433ad-d311-4e67-991a-ad5f01876af9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_KingDigitalEntertainmentMember_4c882fec-c0e9-419e-b8ca-e1faa127cce5" xlink:href="atvi-20211231.xsd#atvi_KingDigitalEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:to="loc_atvi_KingDigitalEntertainmentMember_4c882fec-c0e9-419e-b8ca-e1faa127cce5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_7860b2a1-aade-4058-8267-b2f431582e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bbb3a1c4-5539-4b3b-a3ab-312ea62c4393" xlink:to="loc_us-gaap_CorporateAndOtherMember_7860b2a1-aade-4058-8267-b2f431582e8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_3760b834-ab2c-40ad-ba81-29ed80a2a4df" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_srt_ProductOrServiceAxis_3760b834-ab2c-40ad-ba81-29ed80a2a4df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3760b834-ab2c-40ad-ba81-29ed80a2a4df_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_3760b834-ab2c-40ad-ba81-29ed80a2a4df" xlink:to="loc_srt_ProductsAndServicesDomain_3760b834-ab2c-40ad-ba81-29ed80a2a4df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_3760b834-ab2c-40ad-ba81-29ed80a2a4df" xlink:to="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RevenueExternalCustomersMember_61ff1545-d7a9-4cc1-9292-0ac9fffb868d" xlink:href="atvi-20211231.xsd#atvi_RevenueExternalCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_RevenueExternalCustomersMember_61ff1545-d7a9-4cc1-9292-0ac9fffb868d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RevenueIntersegmentMember_86ebd548-68eb-4738-ad99-a52f25a80b26" xlink:href="atvi-20211231.xsd#atvi_RevenueIntersegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_RevenueIntersegmentMember_86ebd548-68eb-4738-ad99-a52f25a80b26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DigitalOnlineChannelsMember_f6571b36-3cc2-413f-91cb-54a2b395783b" xlink:href="atvi-20211231.xsd#atvi_DigitalOnlineChannelsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_DigitalOnlineChannelsMember_f6571b36-3cc2-413f-91cb-54a2b395783b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RetailChannelsMember_978d9088-8ac1-4ae0-aba8-f6be1c25c8d9" xlink:href="atvi-20211231.xsd#atvi_RetailChannelsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_RetailChannelsMember_978d9088-8ac1-4ae0-aba8-f6be1c25c8d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_OtherDistributionChannelsMember_8168c3ce-43ce-42cb-af27-688d3de9b63d" xlink:href="atvi-20211231.xsd#atvi_OtherDistributionChannelsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_OtherDistributionChannelsMember_8168c3ce-43ce-42cb-af27-688d3de9b63d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ConsoleMember_7622cf67-788b-451f-9f77-0b307b7d559d" xlink:href="atvi-20211231.xsd#atvi_ConsoleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_ConsoleMember_7622cf67-788b-451f-9f77-0b307b7d559d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_PCMember_e160a886-7347-4e90-9c42-2929c906d899" xlink:href="atvi-20211231.xsd#atvi_PCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_PCMember_e160a886-7347-4e90-9c42-2929c906d899" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_MobileAndAncillaryPlatformsMember_2c24f7ae-79c3-4581-a42b-3f42952b4736" xlink:href="atvi-20211231.xsd#atvi_MobileAndAncillaryPlatformsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_MobileAndAncillaryPlatformsMember_2c24f7ae-79c3-4581-a42b-3f42952b4736" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_OtherPlatformMember_0321862c-94e4-4cfe-ba96-d75e83297f11" xlink:href="atvi-20211231.xsd#atvi_OtherPlatformMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da5d8f20-42f1-4b6e-87f9-fa6b5fa2d5ff" xlink:to="loc_atvi_OtherPlatformMember_0321862c-94e4-4cfe-ba96-d75e83297f11" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_cfaae51b-799f-45c8-9f72-a0c410bae686" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_srt_StatementGeographicalAxis_cfaae51b-799f-45c8-9f72-a0c410bae686" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_cfaae51b-799f-45c8-9f72-a0c410bae686_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_cfaae51b-799f-45c8-9f72-a0c410bae686" xlink:to="loc_srt_SegmentGeographicalDomain_cfaae51b-799f-45c8-9f72-a0c410bae686_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_cfaae51b-799f-45c8-9f72-a0c410bae686" xlink:to="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_e35eea02-2713-4f7b-8b9c-e6e0088c6aab" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:to="loc_srt_AmericasMember_e35eea02-2713-4f7b-8b9c-e6e0088c6aab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_b595deea-1e93-4190-9866-6c5cd66dbec7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:to="loc_us-gaap_EMEAMember_b595deea-1e93-4190-9866-6c5cd66dbec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_bb0216e7-c0f5-47e3-9d8b-7559b57b94bd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:to="loc_srt_AsiaPacificMember_bb0216e7-c0f5-47e3-9d8b-7559b57b94bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_e36f0a3b-3157-4bac-9284-74b6c37e4cff" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:to="loc_country_US_e36f0a3b-3157-4bac-9284-74b6c37e4cff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_fad32d6e-5da4-4c23-83ab-d903a28b0799" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_17022f80-f4b3-40e7-a680-763047504cd0" xlink:to="loc_country_GB_fad32d6e-5da4-4c23-83ab-d903a28b0799" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_39add1a4-2247-4c0b-86f2-a88f12d03601" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_39add1a4-2247-4c0b-86f2-a88f12d03601" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_39add1a4-2247-4c0b-86f2-a88f12d03601_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_39add1a4-2247-4c0b-86f2-a88f12d03601" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_39add1a4-2247-4c0b-86f2-a88f12d03601_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_eab787e2-431a-48f5-a6f0-16b78787b926" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_39add1a4-2247-4c0b-86f2-a88f12d03601" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_eab787e2-431a-48f5-a6f0-16b78787b926" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_8854bae9-66ee-496a-85ea-dd5e1891450b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_eab787e2-431a-48f5-a6f0-16b78787b926" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_8854bae9-66ee-496a-85ea-dd5e1891450b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9a37573f-64bc-42c2-9c4a-022adb99d6bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_89953359-4980-45de-a522-71ad0acc655f" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9a37573f-64bc-42c2-9c4a-022adb99d6bf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9a37573f-64bc-42c2-9c4a-022adb99d6bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9a37573f-64bc-42c2-9c4a-022adb99d6bf" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9a37573f-64bc-42c2-9c4a-022adb99d6bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2b977948-515f-4661-99d0-10025493d6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9a37573f-64bc-42c2-9c4a-022adb99d6bf" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2b977948-515f-4661-99d0-10025493d6f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_3e029530-8660-4b62-b096-6c6898a30c27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2b977948-515f-4661-99d0-10025493d6f5" xlink:to="loc_us-gaap_SalesRevenueNetMember_3e029530-8660-4b62-b096-6c6898a30c27" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsNarrativesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ShareBasedPaymentsNarrativesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsNarrativesDetails" xlink:type="extended" id="icea9350acc424de595da3a6cd2c48fef_ShareBasedPaymentsNarrativesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_169f963b-f307-4443-aa48-bef04c303bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_169f963b-f307-4443-aa48-bef04c303bfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_1a16365b-953a-4398-b104-436a2d5c1455" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_1a16365b-953a-4398-b104-436a2d5c1455" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ShareBasedCompensationArrangementPerformanceVestingPercent_fd308f45-baa0-4862-8a77-6e975b2de954" xlink:href="atvi-20211231.xsd#atvi_ShareBasedCompensationArrangementPerformanceVestingPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_atvi_ShareBasedCompensationArrangementPerformanceVestingPercent_fd308f45-baa0-4862-8a77-6e975b2de954" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b03fd3b5-440c-449d-8b0b-963529b0699f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_b03fd3b5-440c-449d-8b0b-963529b0699f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_695430ba-e287-40bd-85de-03e10d3216fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_695430ba-e287-40bd-85de-03e10d3216fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8c11714f-a8ea-4c34-81bd-f6c9fd9822ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_8c11714f-a8ea-4c34-81bd-f6c9fd9822ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_17be1fc8-91b9-482d-8075-e7c6108afaef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_17be1fc8-91b9-482d-8075-e7c6108afaef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_d661f45d-3e86-4f7f-b401-55c9b3bec117" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_d661f45d-3e86-4f7f-b401-55c9b3bec117" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2248ef21-e869-4ef2-a13f-51a20094a431" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2248ef21-e869-4ef2-a13f-51a20094a431" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8511495b-83c8-496b-b2da-f3f6162cc925" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_8511495b-83c8-496b-b2da-f3f6162cc925" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodClosingPrice_f9c123d9-8314-4c4e-b235-7665544eae64" xlink:href="atvi-20211231.xsd#atvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodClosingPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_atvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodClosingPrice_f9c123d9-8314-4c4e-b235-7665544eae64" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_d1aff8d7-3be9-474a-80d9-e929642a1768" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_d1aff8d7-3be9-474a-80d9-e929642a1768" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_e6fc1c78-e55d-46c8-8a70-58e9fbf544ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_e6fc1c78-e55d-46c8-8a70-58e9fbf544ac" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_0bdc4af9-00a2-47f7-8c5a-a100075a982a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_0bdc4af9-00a2-47f7-8c5a-a100075a982a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_89b79abd-1850-4086-9c48-58bc1b163b64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_89b79abd-1850-4086-9c48-58bc1b163b64" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate_9d3db8b1-ed4a-4c83-a714-61f012e89974" xlink:href="atvi-20211231.xsd#atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedWithoutGrantDate_9d3db8b1-ed4a-4c83-a714-61f012e89974" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor_69255bad-15db-47fb-91fb-1881c87516eb" xlink:href="atvi-20211231.xsd#atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_atvi_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationNotYetRecognizedShareBasedAwardsOtherThanOptionsGrantedButNotAccountedFor_69255bad-15db-47fb-91fb-1881c87516eb" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_bf275501-6c3e-4896-b7e4-fbc822a43047" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_bf275501-6c3e-4896-b7e4-fbc822a43047" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_b280e0b7-8c96-4108-a2b2-b8726b4cad0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_b280e0b7-8c96-4108-a2b2-b8726b4cad0e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_e44b4b21-e006-4cba-924c-8efae870f3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_e44b4b21-e006-4cba-924c-8efae870f3fd" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_89d4077c-f0c0-4b94-a936-688e8252aab9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_89d4077c-f0c0-4b94-a936-688e8252aab9" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d25052a0-d3b6-4bb7-ad24-d8dffae05d6b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_337c1d5a-3220-47fe-b6c4-e1ac7aa74e4b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d25052a0-d3b6-4bb7-ad24-d8dffae05d6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7ecb8304-b29f-4c8b-88e1-ad2b021914c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d25052a0-d3b6-4bb7-ad24-d8dffae05d6b" xlink:to="loc_us-gaap_AwardTypeAxis_7ecb8304-b29f-4c8b-88e1-ad2b021914c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ecb8304-b29f-4c8b-88e1-ad2b021914c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7ecb8304-b29f-4c8b-88e1-ad2b021914c8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7ecb8304-b29f-4c8b-88e1-ad2b021914c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7ecb8304-b29f-4c8b-88e1-ad2b021914c8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_fb266aa1-4398-49a5-b186-f0e1954b4be3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_fb266aa1-4398-49a5-b186-f0e1954b4be3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_398a35bf-a1b1-4806-aa93-10f22b4d356b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_us-gaap_PerformanceSharesMember_398a35bf-a1b1-4806-aa93-10f22b4d356b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_0ca272d1-8cdb-4906-8fbb-1bd5f2015d7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_us-gaap_RestrictedStockMember_0ca272d1-8cdb-4906-8fbb-1bd5f2015d7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_EmployeeStockOptionAndRestrictedStockMember_4b30a199-2374-45cd-a061-a877a8cce1c8" xlink:href="atvi-20211231.xsd#atvi_EmployeeStockOptionAndRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_atvi_EmployeeStockOptionAndRestrictedStockMember_4b30a199-2374-45cd-a061-a877a8cce1c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_01445734-030d-48f1-98ae-eac477fc6f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_us-gaap_EmployeeStockOptionMember_01445734-030d-48f1-98ae-eac477fc6f2d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_LiabilityAwardsMember_1da25467-9044-45d7-bc41-a5aa4aac560d" xlink:href="atvi-20211231.xsd#atvi_LiabilityAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6b6edade-399b-4920-b969-af00db616b90" xlink:to="loc_atvi_LiabilityAwardsMember_1da25467-9044-45d7-bc41-a5aa4aac560d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d25052a0-d3b6-4bb7-ad24-d8dffae05d6b" xlink:to="loc_srt_RangeAxis_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e" xlink:to="loc_srt_RangeMember_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_077cc7f7-314b-446f-a2c4-2672527b0668" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d2075fce-6fe1-4ed9-8345-ae7c262b9f1e" xlink:to="loc_srt_RangeMember_077cc7f7-314b-446f-a2c4-2672527b0668" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3251d905-5f32-437b-964d-2624d0f9034c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_077cc7f7-314b-446f-a2c4-2672527b0668" xlink:to="loc_srt_MinimumMember_3251d905-5f32-437b-964d-2624d0f9034c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b4d11f38-a48d-4f0d-aff4-96260d44464b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_077cc7f7-314b-446f-a2c4-2672527b0668" xlink:to="loc_srt_MaximumMember_b4d11f38-a48d-4f0d-aff4-96260d44464b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_467bea69-1d73-404e-b09f-374187711b3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d25052a0-d3b6-4bb7-ad24-d8dffae05d6b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_467bea69-1d73-404e-b09f-374187711b3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_467bea69-1d73-404e-b09f-374187711b3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_467bea69-1d73-404e-b09f-374187711b3b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_467bea69-1d73-404e-b09f-374187711b3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f4b1131c-6419-4551-9156-cf4dd8c41269" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_467bea69-1d73-404e-b09f-374187711b3b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f4b1131c-6419-4551-9156-cf4dd8c41269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_8462707a-491b-4545-8f99-fc0ea933ce5f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f4b1131c-6419-4551-9156-cf4dd8c41269" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_8462707a-491b-4545-8f99-fc0ea933ce5f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsMethodandAssumptionsonValuationofStockOptionsandAwardsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ShareBasedPaymentsMethodandAssumptionsonValuationofStockOptionsandAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsMethodandAssumptionsonValuationofStockOptionsandAwardsDetails" xlink:type="extended" id="i14858ac628784489b7bc13ac83e395d4_ShareBasedPaymentsMethodandAssumptionsonValuationofStockOptionsandAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:href="atvi-20211231.xsd#atvi_ScheduleofSharebasedCompensationAssumptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_090c5b60-e002-4a43-a084-3bc6eafae05d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_090c5b60-e002-4a43-a084-3bc6eafae05d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_91561406-5efb-423d-8dc3-f10919d981f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_91561406-5efb-423d-8dc3-f10919d981f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_b20144dd-19fc-43ff-99d0-9525164c744b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_b20144dd-19fc-43ff-99d0-9525164c744b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1161da7f-5ee6-4409-af30-6f9c525e0ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1161da7f-5ee6-4409-af30-6f9c525e0ca0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9ee86888-1fbc-4bff-9fba-b84e040fa2d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9ee86888-1fbc-4bff-9fba-b84e040fa2d9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_4ad2266a-4176-4e92-ace8-0434bc1dd2cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_4ad2266a-4176-4e92-ace8-0434bc1dd2cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_b5e81513-5b8b-4a2d-a494-7d528801222d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_b5e81513-5b8b-4a2d-a494-7d528801222d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_f75d2e94-3a2f-4fa3-afa2-5fb96a7dc743" xlink:href="atvi-20211231.xsd#atvi_ScheduleofSharebasedCompensationAssumptionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsLineItems_1742ad74-029c-42a8-8b1d-f48510a48da4" xlink:to="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_f75d2e94-3a2f-4fa3-afa2-5fb96a7dc743" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_ScheduleofSharebasedCompensationAssumptionsTable_f75d2e94-3a2f-4fa3-afa2-5fb96a7dc743" xlink:to="loc_us-gaap_AwardTypeAxis_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae80ff73-c52d-45ef-ad7f-c7ac79e9f1be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c807fb62-6f6f-4c8f-9aee-ba6bbf2e5ec3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae80ff73-c52d-45ef-ad7f-c7ac79e9f1be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_d18093ab-11fe-4b2d-bbde-ecb42b2c6bc7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae80ff73-c52d-45ef-ad7f-c7ac79e9f1be" xlink:to="loc_us-gaap_EmployeeStockOptionMember_d18093ab-11fe-4b2d-bbde-ecb42b2c6bc7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsStockOptionActivitiesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ShareBasedPaymentsStockOptionActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsStockOptionActivitiesDetails" xlink:type="extended" id="ie90d1a74027f46739edfc0661a884979_ShareBasedPaymentsStockOptionActivitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1e123ce5-f7ad-4ee6-9b64-d9aefc75160f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1e123ce5-f7ad-4ee6-9b64-d9aefc75160f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c79a75d7-7435-438e-b39e-8671ac909d43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_c79a75d7-7435-438e-b39e-8671ac909d43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_7d473ac2-a292-4f86-b7b5-7f7f7b912ade" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_7d473ac2-a292-4f86-b7b5-7f7f7b912ade" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_8026fb33-9e75-4d75-a127-0d8ced7ed338" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_8026fb33-9e75-4d75-a127-0d8ced7ed338" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_205f43a1-e856-460f-b2a9-336fe8c6387d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_ad7e2126-ccb9-43aa-b145-6dec6b688e18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_205f43a1-e856-460f-b2a9-336fe8c6387d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_8b76c0ea-9b02-4092-ac9f-bd6860804a21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_b684863c-fbf7-4b4a-b400-b5e26a8f45db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_b684863c-fbf7-4b4a-b400-b5e26a8f45db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_b9571cdd-e581-41cf-be22-9ca3eb4207b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_b9571cdd-e581-41cf-be22-9ca3eb4207b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1f2a6e6a-5bc7-4766-ad4b-6abdb624a0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1f2a6e6a-5bc7-4766-ad4b-6abdb624a0d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_4c960fe6-22d8-4c73-97c1-c31e502a0d19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_4c960fe6-22d8-4c73-97c1-c31e502a0d19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4afb512a-e9c6-4dbc-94ee-04d36c2c8b38" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4afb512a-e9c6-4dbc-94ee-04d36c2c8b38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4e73bc5c-1c99-476a-ad28-c9ba5603a7cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4e73bc5c-1c99-476a-ad28-c9ba5603a7cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_a978d8ac-cc83-484f-8db6-7d6a47ce3eea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_cf2b99da-0dec-4c87-88bb-1df30e4b03c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_a978d8ac-cc83-484f-8db6-7d6a47ce3eea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_d1bd7c9e-dc5d-47bd-9c02-f469328e32e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_304b1b6d-37d1-482c-9662-33b41592bb6a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_304b1b6d-37d1-482c-9662-33b41592bb6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_873a1698-1324-45c4-b5b2-f0654a56521e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_873a1698-1324-45c4-b5b2-f0654a56521e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_9b26f4c7-ef7c-4c6b-a9cb-919dc40f26c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_9b26f4c7-ef7c-4c6b-a9cb-919dc40f26c8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_cb6c609c-2c47-4162-99d5-7035df7d3d39" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_cb6c609c-2c47-4162-99d5-7035df7d3d39" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_9c210450-8677-4ae4-8b94-01386b9c1e77" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_9c210450-8677-4ae4-8b94-01386b9c1e77" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_28b6445c-3237-430e-badb-0ab14fb29ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_28b6445c-3237-430e-badb-0ab14fb29ed3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_4f72ee04-15ce-4ef1-89ce-54600fe85cab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_4f72ee04-15ce-4ef1-89ce-54600fe85cab" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_c0776db1-6c6d-4e80-b8b8-67a2769fa9e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_c0776db1-6c6d-4e80-b8b8-67a2769fa9e7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_745b42d7-73c1-42f6-bf24-b9431a55a806" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_399af94c-fe9d-4649-8d17-62ede664e894" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_745b42d7-73c1-42f6-bf24-b9431a55a806" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_745b42d7-73c1-42f6-bf24-b9431a55a806" xlink:to="loc_us-gaap_AwardTypeAxis_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_974b775b-fd82-4398-bb9c-e8c4f95b18c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5ad3fccf-2351-4ee8-8c7b-8c69e2aa13b0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_974b775b-fd82-4398-bb9c-e8c4f95b18c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1703a509-483d-43f2-8f65-65206011f350" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_974b775b-fd82-4398-bb9c-e8c4f95b18c4" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1703a509-483d-43f2-8f65-65206011f350" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsRestrictedStockUnitsandRestrictedStockAwardsActivitiesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ShareBasedPaymentsRestrictedStockUnitsandRestrictedStockAwardsActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsRestrictedStockUnitsandRestrictedStockAwardsActivitiesDetails" xlink:type="extended" id="i8ab81db4e65444128b0224d3e8d6c29c_ShareBasedPaymentsRestrictedStockUnitsandRestrictedStockAwardsActivitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6c793768-d302-4091-997b-a04357f7e928" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6c793768-d302-4091-997b-a04357f7e928" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5276e61f-6f45-4ef6-92c9-ea6bbf27ca8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5276e61f-6f45-4ef6-92c9-ea6bbf27ca8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c03a3f75-4848-4e85-9133-5dfbb14642c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c03a3f75-4848-4e85-9133-5dfbb14642c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_549eb836-d15c-4dc9-aede-6086fbbbd06f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_549eb836-d15c-4dc9-aede-6086fbbbd06f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_43ccb152-5f30-4eca-8764-c51a19aba04e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_8b088a09-6c65-4c21-af32-523ea3ae15ce" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_43ccb152-5f30-4eca-8764-c51a19aba04e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6ada7892-2862-427b-b31a-1435e20589d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6c793768-d302-4091-997b-a04357f7e928" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_134727e6-c862-4b02-b0d0-ef7f7c8dfdc5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_134727e6-c862-4b02-b0d0-ef7f7c8dfdc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_af642b58-b61a-444e-a126-635a76921706" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_af642b58-b61a-444e-a126-635a76921706" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_aef38009-f907-4a68-afdd-4bb6eec57822" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_aef38009-f907-4a68-afdd-4bb6eec57822" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_36c4de01-a5ec-403b-a019-e4fde63dbb87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_a82962e1-d42d-4430-978d-e1122a6795f6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_36c4de01-a5ec-403b-a019-e4fde63dbb87" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ddafa9c1-77f8-43c0-aee5-5fe2b66960a1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56a4b136-9e3b-46c2-b4a9-7a8895361312" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6c793768-d302-4091-997b-a04357f7e928" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56a4b136-9e3b-46c2-b4a9-7a8895361312" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7d19e56f-13c6-4259-90a7-809a5c7ee0d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_56a4b136-9e3b-46c2-b4a9-7a8895361312" xlink:to="loc_us-gaap_AwardTypeAxis_7d19e56f-13c6-4259-90a7-809a5c7ee0d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d19e56f-13c6-4259-90a7-809a5c7ee0d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7d19e56f-13c6-4259-90a7-809a5c7ee0d6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d19e56f-13c6-4259-90a7-809a5c7ee0d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d396d2ee-ba87-4e21-aabf-03da4856f0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7d19e56f-13c6-4259-90a7-809a5c7ee0d6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d396d2ee-ba87-4e21-aabf-03da4856f0c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_c757ccf7-085d-4958-806a-64e4b38ac8f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d396d2ee-ba87-4e21-aabf-03da4856f0c0" xlink:to="loc_us-gaap_RestrictedStockMember_c757ccf7-085d-4958-806a-64e4b38ac8f3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ShareBasedPaymentsStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ShareBasedPaymentsStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ShareBasedPaymentsStockBasedCompensationExpenseDetails" xlink:type="extended" id="i651b36f2b8164a23b6c3fe220362985a_ShareBasedPaymentsStockBasedCompensationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_a56fe374-9008-49bc-af7c-f9b58c13ec85" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_b469aff1-aad0-4baa-84cf-43ac68d67041" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_a56fe374-9008-49bc-af7c-f9b58c13ec85" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_b469aff1-aad0-4baa-84cf-43ac68d67041" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_dfa99174-2d7c-41e9-a348-eed2e328563d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_a56fe374-9008-49bc-af7c-f9b58c13ec85" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_dfa99174-2d7c-41e9-a348-eed2e328563d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_b8a8fb22-d92b-4906-9519-3156ad6e7c94" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_a56fe374-9008-49bc-af7c-f9b58c13ec85" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_b8a8fb22-d92b-4906-9519-3156ad6e7c94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_2f9a5dcf-562f-44eb-8678-c59dcdef0d65" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_a56fe374-9008-49bc-af7c-f9b58c13ec85" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_2f9a5dcf-562f-44eb-8678-c59dcdef0d65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_288dbd49-233a-4851-8b7c-82a8dcdc657e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_2f9a5dcf-562f-44eb-8678-c59dcdef0d65" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_288dbd49-233a-4851-8b7c-82a8dcdc657e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_288dbd49-233a-4851-8b7c-82a8dcdc657e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_288dbd49-233a-4851-8b7c-82a8dcdc657e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_288dbd49-233a-4851-8b7c-82a8dcdc657e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_288dbd49-233a-4851-8b7c-82a8dcdc657e" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_c8d165de-9b6e-4eff-95a3-ecb814ea2281" xlink:href="atvi-20211231.xsd#atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_atvi_CostofRevenuesProductSalesSoftwareRoyaltiesAmortizationandIntellectualPropertyLicensesMember_c8d165de-9b6e-4eff-95a3-ecb814ea2281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember_ba940b54-ada3-413b-a7a0-0d609dd7f63b" xlink:href="atvi-20211231.xsd#atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_atvi_InGameSubscriptionAndOtherGameOperationsAndDistributionMember_ba940b54-ada3-413b-a7a0-0d609dd7f63b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember_5fb4e540-7ebb-4d04-b038-2dc5fcf20928" xlink:href="atvi-20211231.xsd#atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_atvi_InGameSubscriptionAndOtherSoftwareRoyaltiesAmortizationAndIntellectualPropertyLicensesMember_5fb4e540-7ebb-4d04-b038-2dc5fcf20928" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ProductDevelopmentMember_15b779fe-9957-400c-9f7b-c2c9fb855302" xlink:href="atvi-20211231.xsd#atvi_ProductDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_atvi_ProductDevelopmentMember_15b779fe-9957-400c-9f7b-c2c9fb855302" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_95d1a5eb-5571-4185-8fe6-b7b84dbe3aa0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_95d1a5eb-5571-4185-8fe6-b7b84dbe3aa0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_8e9693f1-96e2-4f0f-a043-4baac8138c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_58d78f1b-bc14-4000-9cba-4f299fd9058d" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_8e9693f1-96e2-4f0f-a043-4baac8138c0a" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringScheduleofAccruedRestructuringIncludedinAccruedExpensesandOtherLiabilitiesbyCostTypeDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#RestructuringScheduleofAccruedRestructuringIncludedinAccruedExpensesandOtherLiabilitiesbyCostTypeDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringScheduleofAccruedRestructuringIncludedinAccruedExpensesandOtherLiabilitiesbyCostTypeDetails" xlink:type="extended" id="idd20f64340ee44ea9085bd513923b937_RestructuringScheduleofAccruedRestructuringIncludedinAccruedExpensesandOtherLiabilitiesbyCostTypeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_ed2fa972-c0b9-4578-9b38-d540ae1b696d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ed2fa972-c0b9-4578-9b38-d540ae1b696d" xlink:to="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_a161d79c-1996-4c15-ab55-007613cbfd67" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:to="loc_us-gaap_RestructuringReserve_a161d79c-1996-4c15-ab55-007613cbfd67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_4e2afdb7-1529-437f-907c-5ff8f1d754d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:to="loc_us-gaap_RestructuringCharges_4e2afdb7-1529-437f-907c-5ff8f1d754d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_571dbd12-dae3-4af1-b00d-d47ece66b8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:to="loc_us-gaap_PaymentsForRestructuring_571dbd12-dae3-4af1-b00d-d47ece66b8dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_4eef31db-bf95-4d26-9f10-b132acbb4156" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveSettledWithoutCash2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_64f9c774-bd68-4378-ae2e-4c2a6b1c273a" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash2_4eef31db-bf95-4d26-9f10-b132acbb4156" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_cd9fa848-1f9e-4aad-92e1-b33807390e40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_9d280dfc-3ea5-4ffb-8755-a881a8b516c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ed2fa972-c0b9-4578-9b38-d540ae1b696d" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_9d280dfc-3ea5-4ffb-8755-a881a8b516c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_a50e7e0a-bc84-4689-ac7f-037134d8d0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ed2fa972-c0b9-4578-9b38-d540ae1b696d" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_a50e7e0a-bc84-4689-ac7f-037134d8d0c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_09d70eda-b76a-4882-ac9d-a38311085fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_a50e7e0a-bc84-4689-ac7f-037134d8d0c8" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_09d70eda-b76a-4882-ac9d-a38311085fcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_09d70eda-b76a-4882-ac9d-a38311085fcd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_09d70eda-b76a-4882-ac9d-a38311085fcd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_09d70eda-b76a-4882-ac9d-a38311085fcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_32e26dc8-8f7f-4c39-9c1a-7fb942794923" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_09d70eda-b76a-4882-ac9d-a38311085fcd" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_32e26dc8-8f7f-4c39-9c1a-7fb942794923" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_6f1540e4-4bf8-45af-8d34-e7ab26eb17f3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_32e26dc8-8f7f-4c39-9c1a-7fb942794923" xlink:to="loc_us-gaap_EmployeeSeveranceMember_6f1540e4-4bf8-45af-8d34-e7ab26eb17f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_a29c95b0-a674-4f5f-ab0f-ab6ecc1aa72b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_32e26dc8-8f7f-4c39-9c1a-7fb942794923" xlink:to="loc_us-gaap_FacilityClosingMember_a29c95b0-a674-4f5f-ab0f-ab6ecc1aa72b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_00dcba6e-364a-4a5e-9847-8c97f475af2f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_32e26dc8-8f7f-4c39-9c1a-7fb942794923" xlink:to="loc_us-gaap_OtherRestructuringMember_00dcba6e-364a-4a5e-9847-8c97f475af2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_97500a6e-320a-4704-8c55-6ed1c97ff387" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_a50e7e0a-bc84-4689-ac7f-037134d8d0c8" xlink:to="loc_us-gaap_RestructuringPlanAxis_97500a6e-320a-4704-8c55-6ed1c97ff387" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_97500a6e-320a-4704-8c55-6ed1c97ff387_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_97500a6e-320a-4704-8c55-6ed1c97ff387" xlink:to="loc_us-gaap_RestructuringPlanDomain_97500a6e-320a-4704-8c55-6ed1c97ff387_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_38689eb8-3040-4ee5-8c1a-22494da7b3ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_97500a6e-320a-4704-8c55-6ed1c97ff387" xlink:to="loc_us-gaap_RestructuringPlanDomain_38689eb8-3040-4ee5-8c1a-22494da7b3ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RestructuringPlan2019Member_5cc5723d-b1f0-41e7-a4d1-363610ef48ca" xlink:href="atvi-20211231.xsd#atvi_RestructuringPlan2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_38689eb8-3040-4ee5-8c1a-22494da7b3ed" xlink:to="loc_atvi_RestructuringPlan2019Member_5cc5723d-b1f0-41e7-a4d1-363610ef48ca" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringTotalRestructuringandRelatedCostsbySegmentDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#RestructuringTotalRestructuringandRelatedCostsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringTotalRestructuringandRelatedCostsbySegmentDetails" xlink:type="extended" id="i7d839c7361804d9893a1f89fd6e48b55_RestructuringTotalRestructuringandRelatedCostsbySegmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_a064ea65-eb4c-4c67-99c8-4137258fd015" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_aeb9913d-c7c0-4603-ad86-d8f38833de99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_a064ea65-eb4c-4c67-99c8-4137258fd015" xlink:to="loc_us-gaap_RestructuringCharges_aeb9913d-c7c0-4603-ad86-d8f38833de99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_fbd84f01-f1fb-4d84-94c4-be675e0cd966" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_a064ea65-eb4c-4c67-99c8-4137258fd015" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_fbd84f01-f1fb-4d84-94c4-be675e0cd966" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_c1afd34e-b360-4fce-8875-3c496c20ac10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_fbd84f01-f1fb-4d84-94c4-be675e0cd966" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_c1afd34e-b360-4fce-8875-3c496c20ac10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c1afd34e-b360-4fce-8875-3c496c20ac10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c1afd34e-b360-4fce-8875-3c496c20ac10" xlink:to="loc_us-gaap_SegmentDomain_c1afd34e-b360-4fce-8875-3c496c20ac10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c1afd34e-b360-4fce-8875-3c496c20ac10" xlink:to="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ActivisionMember_0adc6e83-6e5f-4eb4-a7d4-2fa6ff702287" xlink:href="atvi-20211231.xsd#atvi_ActivisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:to="loc_atvi_ActivisionMember_0adc6e83-6e5f-4eb4-a7d4-2fa6ff702287" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BlizzardMember_5c9b0455-fa1a-47cf-9c5b-dff7672c35c1" xlink:href="atvi-20211231.xsd#atvi_BlizzardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:to="loc_atvi_BlizzardMember_5c9b0455-fa1a-47cf-9c5b-dff7672c35c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_KingDigitalEntertainmentMember_b5730739-eb9d-46cb-9951-52ae1dee31ed" xlink:href="atvi-20211231.xsd#atvi_KingDigitalEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:to="loc_atvi_KingDigitalEntertainmentMember_b5730739-eb9d-46cb-9951-52ae1dee31ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_0ed3df56-3150-40b3-a9a8-97a07eaac596" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85c7f27d-4d22-4091-a09d-890ca06409c2" xlink:to="loc_us-gaap_CorporateAndOtherMember_0ed3df56-3150-40b3-a9a8-97a07eaac596" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_79f4d38c-1958-44d1-ad4a-6817d50ba2e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_fbd84f01-f1fb-4d84-94c4-be675e0cd966" xlink:to="loc_us-gaap_PlanNameAxis_79f4d38c-1958-44d1-ad4a-6817d50ba2e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_79f4d38c-1958-44d1-ad4a-6817d50ba2e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_79f4d38c-1958-44d1-ad4a-6817d50ba2e4" xlink:to="loc_us-gaap_PlanNameDomain_79f4d38c-1958-44d1-ad4a-6817d50ba2e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_c4412b09-7d88-4484-8435-8708135a1456" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_79f4d38c-1958-44d1-ad4a-6817d50ba2e4" xlink:to="loc_us-gaap_PlanNameDomain_c4412b09-7d88-4484-8435-8708135a1456" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RestructuringPlan2019Member_e9903676-d74e-4e6a-9733-c83bc8af859d" xlink:href="atvi-20211231.xsd#atvi_RestructuringPlan2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_c4412b09-7d88-4484-8435-8708135a1456" xlink:to="loc_atvi_RestructuringPlan2019Member_e9903676-d74e-4e6a-9733-c83bc8af859d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringNarrativeDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#RestructuringNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringNarrativeDetails" xlink:type="extended" id="i14ccb4f8ec8f4f24ae57fa26c87b4786_RestructuringNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_fd78b06f-428c-45ed-971b-f25a68c682a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RestructuringandRelatedCostExpectedCostPercentage_2f74f7c8-c9c1-4736-b3f6-62ed959ea453" xlink:href="atvi-20211231.xsd#atvi_RestructuringandRelatedCostExpectedCostPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_fd78b06f-428c-45ed-971b-f25a68c682a5" xlink:to="loc_atvi_RestructuringandRelatedCostExpectedCostPercentage_2f74f7c8-c9c1-4736-b3f6-62ed959ea453" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RestructuringAndRelatedCostExpectedToBePaidWithCashOnHandPercentage_1aa59676-4565-423a-aa91-ab047dacb3d2" xlink:href="atvi-20211231.xsd#atvi_RestructuringAndRelatedCostExpectedToBePaidWithCashOnHandPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_fd78b06f-428c-45ed-971b-f25a68c682a5" xlink:to="loc_atvi_RestructuringAndRelatedCostExpectedToBePaidWithCashOnHandPercentage_1aa59676-4565-423a-aa91-ab047dacb3d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad0e0d4d-5abc-40bc-88fe-0c525cb9e4f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_fd78b06f-428c-45ed-971b-f25a68c682a5" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad0e0d4d-5abc-40bc-88fe-0c525cb9e4f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_6246d002-5d9c-4bfa-b653-afa843637f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad0e0d4d-5abc-40bc-88fe-0c525cb9e4f4" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_6246d002-5d9c-4bfa-b653-afa843637f5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_6246d002-5d9c-4bfa-b653-afa843637f5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_6246d002-5d9c-4bfa-b653-afa843637f5c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_6246d002-5d9c-4bfa-b653-afa843637f5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_9ab21584-091b-4ec2-a0eb-903854852606" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_6246d002-5d9c-4bfa-b653-afa843637f5c" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_9ab21584-091b-4ec2-a0eb-903854852606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_333ffa8a-0cbc-47ab-a3fd-8c7cf1ce1e56" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_9ab21584-091b-4ec2-a0eb-903854852606" xlink:to="loc_us-gaap_EmployeeSeveranceMember_333ffa8a-0cbc-47ab-a3fd-8c7cf1ce1e56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_6f12602b-985d-4114-b13e-22c5679dca5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_9ab21584-091b-4ec2-a0eb-903854852606" xlink:to="loc_us-gaap_FacilityClosingMember_6f12602b-985d-4114-b13e-22c5679dca5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_a1bfcfe3-9ca1-424a-84c1-e7603715ac48" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_9ab21584-091b-4ec2-a0eb-903854852606" xlink:to="loc_us-gaap_OtherRestructuringMember_a1bfcfe3-9ca1-424a-84c1-e7603715ac48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_740ef7d7-6245-4d1f-8a3d-fd70e9db100c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_ad0e0d4d-5abc-40bc-88fe-0c525cb9e4f4" xlink:to="loc_us-gaap_RestructuringPlanAxis_740ef7d7-6245-4d1f-8a3d-fd70e9db100c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_740ef7d7-6245-4d1f-8a3d-fd70e9db100c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_740ef7d7-6245-4d1f-8a3d-fd70e9db100c" xlink:to="loc_us-gaap_RestructuringPlanDomain_740ef7d7-6245-4d1f-8a3d-fd70e9db100c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_e5178ba5-87d7-4034-a135-41f4797cf0b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_740ef7d7-6245-4d1f-8a3d-fd70e9db100c" xlink:to="loc_us-gaap_RestructuringPlanDomain_e5178ba5-87d7-4034-a135-41f4797cf0b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_RestructuringPlan2019Member_930df3e1-c0e1-49ad-a8cb-4e15f2e0c284" xlink:href="atvi-20211231.xsd#atvi_RestructuringPlan2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_e5178ba5-87d7-4034-a135-41f4797cf0b5" xlink:to="loc_atvi_RestructuringPlan2019Member_930df3e1-c0e1-49ad-a8cb-4e15f2e0c284" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/RestructuringScheduleofTotalExpectedPretaxRestructuringChargesDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#RestructuringScheduleofTotalExpectedPretaxRestructuringChargesDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/RestructuringScheduleofTotalExpectedPretaxRestructuringChargesDetails" xlink:type="extended" id="i5d22ef97438c418e93475782e0451bd8_RestructuringScheduleofTotalExpectedPretaxRestructuringChargesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_63033742-665c-454d-b03f-613bb0596bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_df34dba8-42da-4d58-b85c-22b57336fcc2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_63033742-665c-454d-b03f-613bb0596bb8" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_df34dba8-42da-4d58-b85c-22b57336fcc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e7ba6358-81d5-4167-ae03-a43b24343020" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_63033742-665c-454d-b03f-613bb0596bb8" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e7ba6358-81d5-4167-ae03-a43b24343020" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7c63c61d-4666-49e0-a1c4-f61e12db2721" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e7ba6358-81d5-4167-ae03-a43b24343020" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7c63c61d-4666-49e0-a1c4-f61e12db2721" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7c63c61d-4666-49e0-a1c4-f61e12db2721_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7c63c61d-4666-49e0-a1c4-f61e12db2721" xlink:to="loc_us-gaap_SegmentDomain_7c63c61d-4666-49e0-a1c4-f61e12db2721_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7c63c61d-4666-49e0-a1c4-f61e12db2721" xlink:to="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ActivisionMember_2d2a63cb-2af4-4733-b17d-b2b316921a72" xlink:href="atvi-20211231.xsd#atvi_ActivisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:to="loc_atvi_ActivisionMember_2d2a63cb-2af4-4733-b17d-b2b316921a72" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_BlizzardMember_2da55698-a45d-4cdc-9f7f-be902203da3f" xlink:href="atvi-20211231.xsd#atvi_BlizzardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:to="loc_atvi_BlizzardMember_2da55698-a45d-4cdc-9f7f-be902203da3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_KingDigitalEntertainmentMember_7a656810-c832-406b-a7a2-2ae340ea6e39" xlink:href="atvi-20211231.xsd#atvi_KingDigitalEntertainmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:to="loc_atvi_KingDigitalEntertainmentMember_7a656810-c832-406b-a7a2-2ae340ea6e39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_1f796f1d-facc-4b97-b1b4-469d94d89386" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bdec8e55-2258-4da4-84b2-590ec69f303d" xlink:to="loc_us-gaap_CorporateAndOtherMember_1f796f1d-facc-4b97-b1b4-469d94d89386" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="if4983caf481649198f55d6b2a12cbd98_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:href="atvi-20211231.xsd#atvi_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_215327a7-df54-4f4f-a442-215b16c0ce23" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_215327a7-df54-4f4f-a442-215b16c0ce23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory_67c453be-a599-4c6f-971c-4f469f0c721a" xlink:href="atvi-20211231.xsd#atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_atvi_NetDeferredTaxAssetIntraentityTransferAssetOtherthanInventory_67c453be-a599-4c6f-971c-4f469f0c721a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DeferredTaxLiabilitiesDomesticTaxOnForeignEarnings_56c4d930-7e49-4e7a-86b1-fc84160e091a" xlink:href="atvi-20211231.xsd#atvi_DeferredTaxLiabilitiesDomesticTaxOnForeignEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_atvi_DeferredTaxLiabilitiesDomesticTaxOnForeignEarnings_56c4d930-7e49-4e7a-86b1-fc84160e091a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_AmortizableTaxBasisRecoveryPeriod_6c9f7284-1f20-4f22-89a1-4f6cd18e6e6e" xlink:href="atvi-20211231.xsd#atvi_AmortizableTaxBasisRecoveryPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_atvi_AmortizableTaxBasisRecoveryPeriod_6c9f7284-1f20-4f22-89a1-4f6cd18e6e6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_9376dc7f-1666-46f2-b2c1-91b3a777049f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_9376dc7f-1666-46f2-b2c1-91b3a777049f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_32668f88-1f79-43ff-bff9-b82ba9403aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_32668f88-1f79-43ff-bff9-b82ba9403aa5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_0f6a87f9-c227-45a6-a440-6aead0cda7af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_0f6a87f9-c227-45a6-a440-6aead0cda7af" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_7d222d89-dbb5-4ead-8ca7-520f83043dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_7d222d89-dbb5-4ead-8ca7-520f83043dfc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_de41f536-672b-4ac1-b6aa-cdf39170c8f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets_de41f536-672b-4ac1-b6aa-cdf39170c8f5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_6e27789b-4f48-4e60-92fa-ceb1a2608f89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets_6e27789b-4f48-4e60-92fa-ceb1a2608f89" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_38f1570f-933d-4038-ad3a-6c84510a4262" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_38f1570f-933d-4038-ad3a-6c84510a4262" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_5d0a7e73-441f-41f6-85d8-30619890b105" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_5d0a7e73-441f-41f6-85d8-30619890b105" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_5e96707c-9d11-4501-bc6c-97a3edc3a107" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_5e96707c-9d11-4501-bc6c-97a3edc3a107" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_cec2f7d0-8183-4640-818e-0e2800e8e6be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense_cec2f7d0-8183-4640-818e-0e2800e8e6be" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:href="atvi-20211231.xsd#atvi_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_atvi_IncomeTaxesLineItems_721cb22e-bab0-4470-9a51-9f8c8e65254f" xlink:to="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_4156f1ec-cddd-4810-be48-f478baa189a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_4156f1ec-cddd-4810-be48-f478baa189a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_4156f1ec-cddd-4810-be48-f478baa189a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_4156f1ec-cddd-4810-be48-f478baa189a2" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_4156f1ec-cddd-4810-be48-f478baa189a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_e7fd2012-647b-4e22-8496-eb419bf8da97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_4156f1ec-cddd-4810-be48-f478baa189a2" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_e7fd2012-647b-4e22-8496-eb419bf8da97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HerMajestysRevenueAndCustomsHMRCMember_ed158d22-62a1-42be-a5ce-3e6a1946431c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HerMajestysRevenueAndCustomsHMRCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_e7fd2012-647b-4e22-8496-eb419bf8da97" xlink:to="loc_us-gaap_HerMajestysRevenueAndCustomsHMRCMember_ed158d22-62a1-42be-a5ce-3e6a1946431c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_01f2fc7b-1da4-4269-8ca6-84119812e01a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_e7fd2012-647b-4e22-8496-eb419bf8da97" xlink:to="loc_us-gaap_DomesticCountryMember_01f2fc7b-1da4-4269-8ca6-84119812e01a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalRevenueServiceIRSMember_7da7b5e5-d91c-4a49-b758-67c82b67990c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InternalRevenueServiceIRSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_e7fd2012-647b-4e22-8496-eb419bf8da97" xlink:to="loc_us-gaap_InternalRevenueServiceIRSMember_7da7b5e5-d91c-4a49-b758-67c82b67990c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_68c8ad11-916a-4b21-9ced-75559fb06f07" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:to="loc_srt_RangeAxis_68c8ad11-916a-4b21-9ced-75559fb06f07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_68c8ad11-916a-4b21-9ced-75559fb06f07_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_68c8ad11-916a-4b21-9ced-75559fb06f07" xlink:to="loc_srt_RangeMember_68c8ad11-916a-4b21-9ced-75559fb06f07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b760d6a0-2b85-4fb0-920b-74f4a7f262f1" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_68c8ad11-916a-4b21-9ced-75559fb06f07" xlink:to="loc_srt_RangeMember_b760d6a0-2b85-4fb0-920b-74f4a7f262f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3ac8682f-91ee-4240-8f08-0535929bd3ac" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b760d6a0-2b85-4fb0-920b-74f4a7f262f1" xlink:to="loc_srt_MinimumMember_3ac8682f-91ee-4240-8f08-0535929bd3ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3e22fd45-7584-4de3-93f2-0001042dfcc0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_b760d6a0-2b85-4fb0-920b-74f4a7f262f1" xlink:to="loc_srt_MaximumMember_3e22fd45-7584-4de3-93f2-0001042dfcc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_04c9ee01-5480-4c48-bb36-93875d978fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_04c9ee01-5480-4c48-bb36-93875d978fc9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_04c9ee01-5480-4c48-bb36-93875d978fc9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_04c9ee01-5480-4c48-bb36-93875d978fc9" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_04c9ee01-5480-4c48-bb36-93875d978fc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_98538516-5b2e-4d6c-b89c-3b1b8099a2f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_04c9ee01-5480-4c48-bb36-93875d978fc9" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_98538516-5b2e-4d6c-b89c-3b1b8099a2f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_2f57560f-9160-4cb7-a744-1e1da7bac8df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_98538516-5b2e-4d6c-b89c-3b1b8099a2f8" xlink:to="loc_us-gaap_DomesticCountryMember_2f57560f-9160-4cb7-a744-1e1da7bac8df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_9efe0466-090b-46ac-8176-10fc2a92ba00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_atvi_IncomeTaxesTable_fe8fd74d-9375-4e4a-a366-2bbf9ae301dd" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_9efe0466-090b-46ac-8176-10fc2a92ba00" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_9efe0466-090b-46ac-8176-10fc2a92ba00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_9efe0466-090b-46ac-8176-10fc2a92ba00" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_9efe0466-090b-46ac-8176-10fc2a92ba00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_99ada7b5-20bc-4b98-b76c-25abacf2f33e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_9efe0466-090b-46ac-8176-10fc2a92ba00" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_99ada7b5-20bc-4b98-b76c-25abacf2f33e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_StateMember_c3a65e81-5c7e-4ec8-86bd-42c524b23e03" xlink:href="atvi-20211231.xsd#atvi_StateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_99ada7b5-20bc-4b98-b76c-25abacf2f33e" xlink:to="loc_atvi_StateMember_c3a65e81-5c7e-4ec8-86bd-42c524b23e03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchMember_073cf825-c614-4630-921e-459ef4078812" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_99ada7b5-20bc-4b98-b76c-25abacf2f33e" xlink:to="loc_us-gaap_ResearchMember_073cf825-c614-4630-921e-459ef4078812" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/ComputationofBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedfromtheComputationofDilutedEarningsPerShareDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#ComputationofBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedfromtheComputationofDilutedEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/ComputationofBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedfromtheComputationofDilutedEarningsPerShareDetails" xlink:type="extended" id="i3a7a118475624fb29c70cc7c1f2428d3_ComputationofBasicDilutedEarningsPerCommonShareWeightedAverageSharesExcludedfromtheComputationofDilutedEarningsPerShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_65cce901-b35b-4d19-be27-8ce4234a907a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_295a793f-3a21-4e37-ba07-6662103abb80" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_65cce901-b35b-4d19-be27-8ce4234a907a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_295a793f-3a21-4e37-ba07-6662103abb80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9acdab45-6e91-4387-8607-7df0798e1f02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_65cce901-b35b-4d19-be27-8ce4234a907a" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9acdab45-6e91-4387-8607-7df0798e1f02" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3241df42-65f5-4b0b-b1fc-5444abf183db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9acdab45-6e91-4387-8607-7df0798e1f02" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3241df42-65f5-4b0b-b1fc-5444abf183db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3241df42-65f5-4b0b-b1fc-5444abf183db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3241df42-65f5-4b0b-b1fc-5444abf183db" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3241df42-65f5-4b0b-b1fc-5444abf183db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fc364678-2989-45ee-bdd0-5ed17d50205a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_3241df42-65f5-4b0b-b1fc-5444abf183db" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fc364678-2989-45ee-bdd0-5ed17d50205a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_7f9d1c9b-fc95-4d8c-ae45-c9c81f917977" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fc364678-2989-45ee-bdd0-5ed17d50205a" xlink:to="loc_us-gaap_StockOptionMember_7f9d1c9b-fc95-4d8c-ae45-c9c81f917977" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/CapitalTransactionsDividendsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#CapitalTransactionsDividendsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/CapitalTransactionsDividendsDetails" xlink:type="extended" id="i06b64724ce304533ac1983dc9891dfbd_CapitalTransactionsDividendsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_5841b974-db3f-4fd9-94d9-faadf24152aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_355649da-d79c-4420-8a57-314b7f03018f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_5841b974-db3f-4fd9-94d9-faadf24152aa" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_355649da-d79c-4420-8a57-314b7f03018f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_127b394a-1970-4ea9-ab23-ca9ddac3517a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_5841b974-db3f-4fd9-94d9-faadf24152aa" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_127b394a-1970-4ea9-ab23-ca9ddac3517a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_68d78d0a-37aa-4ce4-9263-852999c2d29e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_5841b974-db3f-4fd9-94d9-faadf24152aa" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_68d78d0a-37aa-4ce4-9263-852999c2d29e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_d07a9937-7c68-4076-8b8a-6e2947358ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_68d78d0a-37aa-4ce4-9263-852999c2d29e" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_d07a9937-7c68-4076-8b8a-6e2947358ec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_d07a9937-7c68-4076-8b8a-6e2947358ec7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_d07a9937-7c68-4076-8b8a-6e2947358ec7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_d07a9937-7c68-4076-8b8a-6e2947358ec7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7b154e89-5618-4b38-9cd6-8c3de874fed0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_d07a9937-7c68-4076-8b8a-6e2947358ec7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7b154e89-5618-4b38-9cd6-8c3de874fed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_ca6290ce-900b-409d-91c1-647d7d1d1844" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_7b154e89-5618-4b38-9cd6-8c3de874fed0" xlink:to="loc_us-gaap_SubsequentEventMember_ca6290ce-900b-409d-91c1-647d7d1d1844" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended" id="iaa8477b5af214d1bb3d36a802947ba91_CommitmentsandContingenciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_cb91e4c0-ce7b-4739-accb-f5b00da3f751" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_82fdb6cd-b5d7-4e1a-a033-81f4235af499" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_cb91e4c0-ce7b-4739-accb-f5b00da3f751" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_82fdb6cd-b5d7-4e1a-a033-81f4235af499" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_AvailabilityForLettersOfCredit_c6ea973d-4b2a-4534-89c3-36afa8923a98" xlink:href="atvi-20211231.xsd#atvi_AvailabilityForLettersOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_cb91e4c0-ce7b-4739-accb-f5b00da3f751" xlink:to="loc_atvi_AvailabilityForLettersOfCredit_c6ea973d-4b2a-4534-89c3-36afa8923a98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_c89fba2f-3f28-49d0-a416-f8049f605e41" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_cb91e4c0-ce7b-4739-accb-f5b00da3f751" xlink:to="loc_us-gaap_LossContingenciesTable_c89fba2f-3f28-49d0-a416-f8049f605e41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_99c1f4ce-e927-4b63-8326-95348ef6313d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c89fba2f-3f28-49d0-a416-f8049f605e41" xlink:to="loc_us-gaap_LitigationStatusAxis_99c1f4ce-e927-4b63-8326-95348ef6313d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_99c1f4ce-e927-4b63-8326-95348ef6313d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_99c1f4ce-e927-4b63-8326-95348ef6313d" xlink:to="loc_us-gaap_LitigationStatusDomain_99c1f4ce-e927-4b63-8326-95348ef6313d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_72305915-cbcd-4277-9fae-7c1348ec785b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_99c1f4ce-e927-4b63-8326-95348ef6313d" xlink:to="loc_us-gaap_LitigationStatusDomain_72305915-cbcd-4277-9fae-7c1348ec785b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SettledLitigationMember_5f4ea27c-8e6a-4865-9751-dafd2ed6ed17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SettledLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_72305915-cbcd-4277-9fae-7c1348ec785b" xlink:to="loc_us-gaap_SettledLitigationMember_5f4ea27c-8e6a-4865-9751-dafd2ed6ed17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_c73e7adb-02e4-4cfc-b419-fe6abac06aba" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c89fba2f-3f28-49d0-a416-f8049f605e41" xlink:to="loc_srt_LitigationCaseAxis_c73e7adb-02e4-4cfc-b419-fe6abac06aba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_c73e7adb-02e4-4cfc-b419-fe6abac06aba_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_c73e7adb-02e4-4cfc-b419-fe6abac06aba" xlink:to="loc_srt_LitigationCaseTypeDomain_c73e7adb-02e4-4cfc-b419-fe6abac06aba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_f275b4c9-add3-4672-9212-8717265569cb" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_c73e7adb-02e4-4cfc-b419-fe6abac06aba" xlink:to="loc_srt_LitigationCaseTypeDomain_f275b4c9-add3-4672-9212-8717265569cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_EEOCPendingSettlementMember_1cf5da0f-e3ab-42b8-9a4f-32f96a01ea03" xlink:href="atvi-20211231.xsd#atvi_EEOCPendingSettlementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_f275b4c9-add3-4672-9212-8717265569cb" xlink:to="loc_atvi_EEOCPendingSettlementMember_1cf5da0f-e3ab-42b8-9a4f-32f96a01ea03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_318e632e-1ea2-4694-a9dd-e8fd149af3ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_c89fba2f-3f28-49d0-a416-f8049f605e41" xlink:to="loc_us-gaap_DebtInstrumentAxis_318e632e-1ea2-4694-a9dd-e8fd149af3ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_318e632e-1ea2-4694-a9dd-e8fd149af3ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_318e632e-1ea2-4694-a9dd-e8fd149af3ef" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_318e632e-1ea2-4694-a9dd-e8fd149af3ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2e90a81a-d914-4a31-8b53-f589e9cb3aae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_318e632e-1ea2-4694-a9dd-e8fd149af3ef" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2e90a81a-d914-4a31-8b53-f589e9cb3aae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_CreditAgreementasAmendedMember_d39ad7e2-c977-4f64-aa85-fa3d8e66e8f4" xlink:href="atvi-20211231.xsd#atvi_CreditAgreementasAmendedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2e90a81a-d914-4a31-8b53-f589e9cb3aae" xlink:to="loc_atvi_CreditAgreementasAmendedMember_d39ad7e2-c977-4f64-aa85-fa3d8e66e8f4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/CommitmentsandContingenciesFutureMinimumCommitmentsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#CommitmentsandContingenciesFutureMinimumCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/CommitmentsandContingenciesFutureMinimumCommitmentsDetails" xlink:type="extended" id="i96bf3856bf474050907e0ab39453b452_CommitmentsandContingenciesFutureMinimumCommitmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermPurchaseCommitmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_81060ae7-1c46-488d-a755-e9b5e5420741" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_81060ae7-1c46-488d-a755-e9b5e5420741" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInSecondYear_3b26cfaf-3e73-4312-844f-37d476a8ab6a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueInSecondYear_3b26cfaf-3e73-4312-844f-37d476a8ab6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInThirdYear_7bb49c36-7927-4ef2-a291-73811899c3a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueInThirdYear_7bb49c36-7927-4ef2-a291-73811899c3a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInFourthYear_57a39de8-4eec-42ad-a06c-c81f57cffe33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueInFourthYear_57a39de8-4eec-42ad-a06c-c81f57cffe33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInFifthYear_462e9f61-89da-46ee-a571-657fe045deb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueInFifthYear_462e9f61-89da-46ee-a571-657fe045deb1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueAfterFifthYear_00639a90-b71d-409d-92f4-a782b4fe7b32" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligationDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligationDueAfterFifthYear_00639a90-b71d-409d-92f4-a782b4fe7b32" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligation_436cfca9-3920-4a50-8d94-b6ea061c7eff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractualObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_ContractualObligation_436cfca9-3920-4a50-8d94-b6ea061c7eff" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_UnrecognizedTaxBenefitsNetNoncurrent_5fb6b93c-b038-4de0-aab6-f73d99232191" xlink:href="atvi-20211231.xsd#atvi_UnrecognizedTaxBenefitsNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_atvi_UnrecognizedTaxBenefitsNetNoncurrent_5fb6b93c-b038-4de0-aab6-f73d99232191" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability_921dbd3b-a5ed-4cd8-8c2a-f13f75dec12d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability_921dbd3b-a5ed-4cd8-8c2a-f13f75dec12d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_53ce5504-4841-42c9-b985-4926668ed75a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermPurchaseCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_4a422cec-dead-41ef-8e5d-fdb340e1afa6" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_53ce5504-4841-42c9-b985-4926668ed75a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a713c7dd-1c0b-4fd4-8586-0525a7f70e71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_53ce5504-4841-42c9-b985-4926668ed75a" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a713c7dd-1c0b-4fd4-8586-0525a7f70e71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_a713c7dd-1c0b-4fd4-8586-0525a7f70e71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a713c7dd-1c0b-4fd4-8586-0525a7f70e71" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_a713c7dd-1c0b-4fd4-8586-0525a7f70e71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_277a75b2-dd71-425b-b254-f419821ead2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a713c7dd-1c0b-4fd4-8586-0525a7f70e71" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_277a75b2-dd71-425b-b254-f419821ead2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:href="atvi-20211231.xsd#atvi_ContractualObligationsNonCancelableOperatingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_277a75b2-dd71-425b-b254-f419821ead2b" xlink:to="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_FacilityAndEquipmentLeasesMember_d0e6210c-5868-4445-ad5a-d28401590d43" xlink:href="atvi-20211231.xsd#atvi_FacilityAndEquipmentLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:to="loc_atvi_FacilityAndEquipmentLeasesMember_d0e6210c-5868-4445-ad5a-d28401590d43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_DeveloperandHostingMember_99822956-1e3a-44bb-bb72-71f096659484" xlink:href="atvi-20211231.xsd#atvi_DeveloperandHostingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:to="loc_atvi_DeveloperandHostingMember_99822956-1e3a-44bb-bb72-71f096659484" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_MarketingCommitmentsMember_db77cc07-f11f-4cd1-ba28-d8ab93e009d1" xlink:href="atvi-20211231.xsd#atvi_MarketingCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:to="loc_atvi_MarketingCommitmentsMember_db77cc07-f11f-4cd1-ba28-d8ab93e009d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_LongTermDebtObligationsMember_6f9e6803-ec2e-44ae-9570-f172ec22ebb5" xlink:href="atvi-20211231.xsd#atvi_LongTermDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_atvi_ContractualObligationsNonCancelableOperatingLeaseMember_5574a0a0-f324-4276-8a80-badcb8ef21f2" xlink:to="loc_atvi_LongTermDebtObligationsMember_6f9e6803-ec2e-44ae-9570-f172ec22ebb5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SubsequentEventsDetails" xlink:type="extended" id="ia2fddc1231374a6db2a3c9092e6e8ba8_SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_b660102b-e87a-4339-a1cc-ea35f1fdf7c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_b660102b-e87a-4339-a1cc-ea35f1fdf7c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_eff9d84c-c6c1-451a-9e5f-61f6bc19bae3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_eff9d84c-c6c1-451a-9e5f-61f6bc19bae3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ContractTerminationFee_d3e95984-47b7-4160-bc05-d053524f7f07" xlink:href="atvi-20211231.xsd#atvi_ContractTerminationFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_atvi_ContractTerminationFee_d3e95984-47b7-4160-bc05-d053524f7f07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_TerminationFeeScenarioOne_5f0cf741-8f88-40e6-9957-561b57b8f7ce" xlink:href="atvi-20211231.xsd#atvi_TerminationFeeScenarioOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_atvi_TerminationFeeScenarioOne_5f0cf741-8f88-40e6-9957-561b57b8f7ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_TerminationFeeScenarioTwo_253e52d1-5e9d-4c59-997d-6f5022769b67" xlink:href="atvi-20211231.xsd#atvi_TerminationFeeScenarioTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_atvi_TerminationFeeScenarioTwo_253e52d1-5e9d-4c59-997d-6f5022769b67" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_TerminationFeeScenarioThree_28ea9a49-885d-42b6-a008-b5d74e690acc" xlink:href="atvi-20211231.xsd#atvi_TerminationFeeScenarioThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_atvi_TerminationFeeScenarioThree_28ea9a49-885d-42b6-a008-b5d74e690acc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_ae184529-2364-47f6-8e0f-6e0c6485c7cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_dce3fb3d-90c5-40dc-804f-35c4de4db53f" xlink:to="loc_us-gaap_SubsequentEventTable_ae184529-2364-47f6-8e0f-6e0c6485c7cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_b4edfa75-53b2-41d9-bd53-453f5b755023" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_ae184529-2364-47f6-8e0f-6e0c6485c7cc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_b4edfa75-53b2-41d9-bd53-453f5b755023" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b4edfa75-53b2-41d9-bd53-453f5b755023_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b4edfa75-53b2-41d9-bd53-453f5b755023" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b4edfa75-53b2-41d9-bd53-453f5b755023_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a8b9dd1d-e40d-4c7c-8970-8c5053d53bf8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b4edfa75-53b2-41d9-bd53-453f5b755023" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a8b9dd1d-e40d-4c7c-8970-8c5053d53bf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_ActivisionBlizzardIncMember_61888b27-c88e-4c9b-aa53-85ea48daf1fe" xlink:href="atvi-20211231.xsd#atvi_ActivisionBlizzardIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a8b9dd1d-e40d-4c7c-8970-8c5053d53bf8" xlink:to="loc_atvi_ActivisionBlizzardIncMember_61888b27-c88e-4c9b-aa53-85ea48daf1fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_8d40a955-f87f-4541-bd22-c1821cbe80c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_ae184529-2364-47f6-8e0f-6e0c6485c7cc" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_8d40a955-f87f-4541-bd22-c1821cbe80c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_8d40a955-f87f-4541-bd22-c1821cbe80c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8d40a955-f87f-4541-bd22-c1821cbe80c0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_8d40a955-f87f-4541-bd22-c1821cbe80c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_dafcf849-2a47-4792-ae3d-d007557a99d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_8d40a955-f87f-4541-bd22-c1821cbe80c0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_dafcf849-2a47-4792-ae3d-d007557a99d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_ea40c82e-18ef-48cc-8a3c-76c5d6cf949e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_dafcf849-2a47-4792-ae3d-d007557a99d9" xlink:to="loc_us-gaap_SubsequentEventMember_ea40c82e-18ef-48cc-8a3c-76c5d6cf949e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_24fee602-5299-4bb1-a3b9-b975ed5204cc" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_ae184529-2364-47f6-8e0f-6e0c6485c7cc" xlink:to="loc_dei_LegalEntityAxis_24fee602-5299-4bb1-a3b9-b975ed5204cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_24fee602-5299-4bb1-a3b9-b975ed5204cc_default" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_24fee602-5299-4bb1-a3b9-b975ed5204cc" xlink:to="loc_dei_EntityDomain_24fee602-5299-4bb1-a3b9-b975ed5204cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e89f98ca-71a1-4d32-8320-a9f37cb15d65" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_24fee602-5299-4bb1-a3b9-b975ed5204cc" xlink:to="loc_dei_EntityDomain_e89f98ca-71a1-4d32-8320-a9f37cb15d65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_MicrosoftMember_902b5e39-4829-4676-924f-0a5e2d61fc09" xlink:href="atvi-20211231.xsd#atvi_MicrosoftMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_e89f98ca-71a1-4d32-8320-a9f37cb15d65" xlink:to="loc_atvi_MicrosoftMember_902b5e39-4829-4676-924f-0a5e2d61fc09" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.activision.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails" xlink:type="simple" xlink:href="atvi-20211231.xsd#SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails"/>
  <link:definitionLink xlink:role="http://www.activision.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails" xlink:type="extended" id="i3aa7fa253c7e410b872ca6a0098f4e30_SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_a64d65f2-4abf-43f6-a390-ced556b1b33a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_e6cb9502-3927-4e3c-8f2c-63fe274d171a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_a64d65f2-4abf-43f6-a390-ced556b1b33a" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_e6cb9502-3927-4e3c-8f2c-63fe274d171a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_32ec9be2-b525-4021-bbae-77182be41dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_e6cb9502-3927-4e3c-8f2c-63fe274d171a" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_32ec9be2-b525-4021-bbae-77182be41dcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_77bd27c1-5028-4b41-be58-bd371533cb29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_e6cb9502-3927-4e3c-8f2c-63fe274d171a" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_77bd27c1-5028-4b41-be58-bd371533cb29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_30b8be4a-3571-4f74-b401-fada76dcfc4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_e6cb9502-3927-4e3c-8f2c-63fe274d171a" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_30b8be4a-3571-4f74-b401-fada76dcfc4a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_5c7b41d1-388f-453e-9768-8eb7872c266e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_f7f77434-602c-4a3c-bdce-0ebd8e328c24" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_a64d65f2-4abf-43f6-a390-ced556b1b33a" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_f7f77434-602c-4a3c-bdce-0ebd8e328c24" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_b3c815ed-39c8-42d2-a9e8-da82246fcea1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_f7f77434-602c-4a3c-bdce-0ebd8e328c24" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_b3c815ed-39c8-42d2-a9e8-da82246fcea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_b3c815ed-39c8-42d2-a9e8-da82246fcea1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_b3c815ed-39c8-42d2-a9e8-da82246fcea1" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_b3c815ed-39c8-42d2-a9e8-da82246fcea1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_2c6eafcb-2b9d-427d-9a51-949d36025607" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_b3c815ed-39c8-42d2-a9e8-da82246fcea1" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_2c6eafcb-2b9d-427d-9a51-949d36025607" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember_a4ae0da4-2897-4096-a317-2c5545e08089" xlink:href="atvi-20211231.xsd#atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_2c6eafcb-2b9d-427d-9a51-949d36025607" xlink:to="loc_atvi_AllowanceForSalesReturnsPriceProtectionAndOtherAllowanceMember_a4ae0da4-2897-4096-a317-2c5545e08089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_8df4ec21-e66f-4125-9cf6-a9c38882a9b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_2c6eafcb-2b9d-427d-9a51-949d36025607" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_8df4ec21-e66f-4125-9cf6-a9c38882a9b2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OperatingLeaseLiability" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
