<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<link:linkbase xmlns:ns6="http://www.sec.gov/edgar/common" xmlns:ns5="http://www.sec.gov/edgar/singlefilersc" xmlns:ns8="http://www.sec.gov/edgar/coregsc" xmlns:ns7="http://www.sec.gov/edgar/sccommon" xmlns:ns9="http://www.sec.gov/edgar/bulkfiling" xmlns:ns11="http://xbrl.org/2006/xbrldi" xmlns:ns10="http://www.sec.gov/edgar/feecommon" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ns4="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ns3="http://www.xbrl.org/2003/XLink">
    <link:roleRef roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SeriesOnly"/>
    <link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly"/>
    <link:roleRef roleURI="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#RiskOnly"/>
    <link:roleRef roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#PerformanceMeasureOnly"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DocumentInformation" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DocumentInformation"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000084938_FidelityEquityMarketNeutralFund-AMCIZPro" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000084938_FidelityEquityMarketNeutralFund-AMCIZPro"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000084938_FidelityEquityMarketNeutralFund-AMCIZPro" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000084938_FidelityEquityMarketNeutralFund-AMCIZPro"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000084938_FidelityEquityMarketNeutralFund-RetailPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000084938_FidelityEquityMarketNeutralFund-RetailPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000084938_FidelityEquityMarketNeutralFund-RetailPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000084938_FidelityEquityMarketNeutralFund-RetailPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000077302_FidelityHedgedEquityFund-RetailPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000077302_FidelityHedgedEquityFund-RetailPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000077302_FidelityHedgedEquityFund-RetailPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000077302_FidelityHedgedEquityFund-RetailPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000077302_FidelityHedgedEquityFund-AMCIZPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000077302_FidelityHedgedEquityFund-AMCIZPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000077302_FidelityHedgedEquityFund-AMCIZPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000077302_FidelityHedgedEquityFund-AMCIZPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000075414_FidelityMacroOpportunitiesRiskParityFunds-AMCIZComboPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000075414_FidelityMacroOpportunitiesRiskParityFunds-AMCIZComboPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000075414_FidelityMacroOpportunitiesRiskParityFunds-AMCIZComboPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000075414_FidelityMacroOpportunitiesRiskParityFunds-AMCIZComboPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000075414_FidelityMacroOpportunitiesRiskParityFunds-RetailComboPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000075414_FidelityMacroOpportunitiesRiskParityFunds-RetailComboPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000075414_FidelityMacroOpportunitiesRiskParityFunds-RetailComboPRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000075414_FidelityMacroOpportunitiesRiskParityFunds-RetailComboPRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000081303_FidelitySAIConvertibleArbitrageFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000081303_FidelitySAIConvertibleArbitrageFund-PRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000081303_FidelitySAIConvertibleArbitrageFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000081303_FidelitySAIConvertibleArbitrageFund-PRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000091042_FidelitySAIManagedFuturesFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000091042_FidelitySAIManagedFuturesFund-PRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000091042_FidelitySAIManagedFuturesFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000091042_FidelitySAIManagedFuturesFund-PRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/RiskSummaryS000091043_FidelitySAIMergerArbitrageFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_RiskSummaryS000091043_FidelitySAIMergerArbitrageFund-PRO"/>
    <link:roleRef roleURI="http://www.fidelity.com/role/DisclosureDetailS000091043_FidelitySAIMergerArbitrageFund-PRO" xlink:type="simple" xlink:href="fmr-20260401.xsd#role_DisclosureDetailS000091043_FidelitySAIMergerArbitrageFund-PRO"/>
    <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-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/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/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
    <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:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly" xlink:title="050020 - Document - Series">
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis"/>
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain" xlink:label="EntityDomain"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000077302Member" xlink:label="fmr_S000077302Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000077302Member" order="10.1"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000075414Member" xlink:label="fmr_S000075414Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000075414Member" order="10.2"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000081303Member" xlink:label="fmr_S000081303Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000081303Member" order="10.3"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000084938Member" xlink:label="fmr_S000084938Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000084938Member" order="10.4"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000091043Member" xlink:label="fmr_S000091043Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000091043Member" order="10.5"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_S000091042Member" xlink:label="fmr_S000091042Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="fmr_S000091042Member" order="10.6"/>
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:title="050030 - Document - Class">
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237599Member" xlink:label="fmr_C000237599Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237634Member" xlink:label="fmr_C000237634Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237633Member" xlink:label="fmr_C000237633Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237632Member" xlink:label="fmr_C000237632Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237630Member" xlink:label="fmr_C000237630Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000237631Member" xlink:label="fmr_C000237631Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234495Member" xlink:label="fmr_C000234495Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000243999Member" xlink:label="fmr_C000243999Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234496Member" xlink:label="fmr_C000234496Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234491Member" xlink:label="fmr_C000234491Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234492Member" xlink:label="fmr_C000234492Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234493Member" xlink:label="fmr_C000234493Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000234494Member" xlink:label="fmr_C000234494Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249702Member" xlink:label="fmr_C000249702Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249704Member" xlink:label="fmr_C000249704Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249703Member" xlink:label="fmr_C000249703Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249705Member" xlink:label="fmr_C000249705Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249701Member" xlink:label="fmr_C000249701Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000249700Member" xlink:label="fmr_C000249700Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000258438Member" xlink:label="fmr_C000258438Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_C000258437Member" xlink:label="fmr_C000258437Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237599Member" order="2"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237634Member" order="3"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237633Member" order="4"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237632Member" order="5"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237630Member" order="6"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000237631Member" order="7"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234495Member" order="8"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000243999Member" order="9"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234496Member" order="10"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234491Member" order="11"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234492Member" order="12"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234493Member" order="13"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000234494Member" order="14"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249702Member" order="15"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249704Member" order="16"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249703Member" order="17"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249705Member" order="18"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249701Member" order="19"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000249700Member" order="20"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000258438Member" order="21"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="fmr_C000258437Member" order="22"/>
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:title="050010 - Document - Risk">
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AllRisksMember" xlink:label="AllRisksMember"/>
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_RiskAxis" xlink:label="RiskAxis"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_OptionsRiskMember" xlink:label="OptionsRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="OptionsRiskMember" order="500"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_AssetAllocationRiskMember" xlink:label="AssetAllocationRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="AssetAllocationRiskMember" order="500.1"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_CurrencyExposureMember" xlink:label="CurrencyExposureMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CurrencyExposureMember" order="500.2"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_SubsidiaryRiskMember" xlink:label="SubsidiaryRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="SubsidiaryRiskMember" order="500.3"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ConvertibleArbitrageStrategyMember" xlink:label="ConvertibleArbitrageStrategyMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ConvertibleArbitrageStrategyMember" order="500.4"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_InterestRateChangesMember" xlink:label="InterestRateChangesMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InterestRateChangesMember" order="500.5"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ContractsForDifferenceCfdRiskMember" xlink:label="ContractsForDifferenceCfdRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ContractsForDifferenceCfdRiskMember" order="500.6"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_QuantitativeInvestingMember" xlink:label="QuantitativeInvestingMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="QuantitativeInvestingMember" order="500.7"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ForeignCurrencyTransactionsMember" xlink:label="ForeignCurrencyTransactionsMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ForeignCurrencyTransactionsMember" order="500.8"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ShortSalesAndLeverageRiskMember" xlink:label="ShortSalesAndLeverageRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ShortSalesAndLeverageRiskMember" order="500.9"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_CommodityLinkedInvestingMember" xlink:label="CommodityLinkedInvestingMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CommodityLinkedInvestingMember" order="501.0"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_MergerArbitrageStrategyMember" xlink:label="MergerArbitrageStrategyMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MergerArbitrageStrategyMember" order="501.1"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_FuturesContractRiskMember" xlink:label="FuturesContractRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="FuturesContractRiskMember" order="501.2"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_PrepaymentMember" xlink:label="PrepaymentMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PrepaymentMember" order="501.3"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_MidCapInvestingMember" xlink:label="MidCapInvestingMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MidCapInvestingMember" order="501.4"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_USGovernmentObligationsRiskMember" xlink:label="USGovernmentObligationsRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="USGovernmentObligationsRiskMember" order="501.5"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_GeographicExposureToEuropeMember" xlink:label="GeographicExposureToEuropeMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="GeographicExposureToEuropeMember" order="501.6"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_SpecialPurposeAcquisitionCompaniesRiskSpacRiskMember" xlink:label="SpecialPurposeAcquisitionCompaniesRiskSpacRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="SpecialPurposeAcquisitionCompaniesRiskSpacRiskMember" order="501.7"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_InvestingInExchangeTradedFundsEtfsAndEtnsMember" xlink:label="InvestingInExchangeTradedFundsEtfsAndEtnsMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InvestingInExchangeTradedFundsEtfsAndEtnsMember" order="501.8"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ForeignAndEmergingMarketsRiskMember" xlink:label="ForeignAndEmergingMarketsRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ForeignAndEmergingMarketsRiskMember" order="501.9"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_LeverageRiskMember" xlink:label="LeverageRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="LeverageRiskMember" order="502.0"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_InvestingInOtherFundsMember" xlink:label="InvestingInOtherFundsMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InvestingInOtherFundsMember" order="502.1"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IssuerSpecificChangesMember" xlink:label="IssuerSpecificChangesMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="IssuerSpecificChangesMember" order="502.2"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_StockMarketVolatilityMember" xlink:label="StockMarketVolatilityMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="StockMarketVolatilityMember" order="502.3"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_SmallCapInvestingMember" xlink:label="SmallCapInvestingMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="SmallCapInvestingMember" order="502.4"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_CommodityFuturesMember" xlink:label="CommodityFuturesMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CommodityFuturesMember" order="502.5"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_CorrelationRiskMember" xlink:label="CorrelationRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CorrelationRiskMember" order="502.6"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_HighPortfolioTurnoverMember" xlink:label="HighPortfolioTurnoverMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="HighPortfolioTurnoverMember" order="502.7"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_InvestingInEtfsAndEtnsMember" xlink:label="InvestingInEtfsAndEtnsMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InvestingInEtfsAndEtnsMember" order="502.8"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_ForeignExposureMember" xlink:label="ForeignExposureMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ForeignExposureMember" order="502.9"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_SwapsRiskMember" xlink:label="SwapsRiskMember"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="SwapsRiskMember" order="503.0"/>
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" xlink:title="050040 - Document - Performance Measure">
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_PerformanceMeasureDomain" xlink:label="PerformanceMeasureDomain"/>
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AfterTaxesOnDistributionsMember" xlink:label="AfterTaxesOnDistributionsMember"/>
        <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AfterTaxesOnDistributionsAndSalesMember" xlink:label="AfterTaxesOnDistributionsAndSalesMember"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexIXUYKMember" xlink:label="fmr_IndexIXUYKMember"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexSP001Member" xlink:label="fmr_IndexSP001Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexIXWWBMember" xlink:label="fmr_IndexIXWWBMember"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexIXSSCMember" xlink:label="fmr_IndexIXSSCMember"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexMS159Member" xlink:label="fmr_IndexMS159Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexLB057Member" xlink:label="fmr_IndexLB057Member"/>
        <link:loc xlink:type="locator" xlink:href="fmr-20260401.xsd#fmr_IndexLB001Member" xlink:label="fmr_IndexLB001Member"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexIXUYKMember" order="5"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexSP001Member" order="6"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexIXWWBMember" order="7"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexIXSSCMember" order="8"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexMS159Member" order="9"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexLB057Member" order="10"/>
        <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="fmr_IndexLB001Member" order="11"/>
    </link:definitionLink>
</link:linkbase>
