<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.4b -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByIndustrySector" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByIndustrySector" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByGeographicRegion" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByGeographicRegion" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByCreditQuality" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByCreditQuality" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByMaturity" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByMaturity" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByAssetCategory" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByAssetCategory" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByOtherCategory" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByOtherCategory" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingsByOtherCategory2" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByOtherCategory2" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#LargestHoldings" roleURI="http://xbrl.sec.gov/oef/role/LargestHoldings" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ProspectusOnly" roleURI="http://xbrl.sec.gov/rr/role/ProspectusOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#RiskOnly" roleURI="http://xbrl.sec.gov/rr/role/RiskOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#CoregistrantOnly" roleURI="http://xbrl.sec.gov/oef/role/CoregistrantOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly" roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#PerformanceMeasureOnly" roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingAssetCategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/HoldingAssetCategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#BroadBasedIndexOnly" roleURI="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#AdditionalIndexOnly" roleURI="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#IndustrySectorOnly" roleURI="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#GeographicRegionOnly" roleURI="http://xbrl.sec.gov/oef/role/GeographicRegionOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#CreditQualityOnly" roleURI="http://xbrl.sec.gov/oef/role/CreditQualityOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#MaturityOnly" roleURI="http://xbrl.sec.gov/oef/role/MaturityOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other1CategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#Other2CategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/Other2CategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#LargestHoldingOnly" roleURI="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SalesLoadOnly" roleURI="http://xbrl.sec.gov/oef/role/SalesLoadOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#HoldingMeasureOnly" roleURI="http://xbrl.sec.gov/oef/role/HoldingMeasureOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ValueMeasureOnly" roleURI="http://xbrl.sec.gov/oef/role/ValueMeasureOnly" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/ProspectusOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AllRisksMember" xlink:label="loc_oefAllRisksMember" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EquitySecuritiesRiskMember" xlink:label="loc_zackEquitySecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEquitySecuritiesRiskMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_LargecapSecuritiesRiskMember" xlink:label="loc_zackLargecapSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackLargecapSecuritiesRiskMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ManagementRiskMember" xlink:label="loc_zackManagementRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackManagementRiskMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_QuantitativeModelRiskMember" xlink:label="loc_zackQuantitativeModelRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackQuantitativeModelRiskMember" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_SmallAndMediumCapSecuritiesRiskMember" xlink:label="loc_zackSmallAndMediumCapSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackSmallAndMediumCapSecuritiesRiskMember" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_CommonStockRiskMember" xlink:label="loc_zackCommonStockRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackCommonStockRiskMember" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_NewAdvisorRiskMember" xlink:label="loc_zackNewAdvisorRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackNewAdvisorRiskMember" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_MarketRiskMember" xlink:label="loc_zackMarketRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackMarketRiskMember" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_NewFundRiskMember" xlink:label="loc_zackNewFundRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackNewFundRiskMember" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_AuthorizedParticipantRiskMember" xlink:label="loc_zackAuthorizedParticipantRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackAuthorizedParticipantRiskMember" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EarlyClosetradingHaltRiskMember" xlink:label="loc_zackEarlyClosetradingHaltRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEarlyClosetradingHaltRiskMember" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EtfStructureRisksMember" xlink:label="loc_zackEtfStructureRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEtfStructureRisksMember" xlink:type="arc" order="110" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_InvestmentRiskMember" xlink:label="loc_zackInvestmentRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackInvestmentRiskMember" xlink:type="arc" order="120" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_CybersecurityRiskMember" xlink:label="loc_zackCybersecurityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackCybersecurityRiskMember" xlink:type="arc" order="130" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_MarketDisruptionAndGeopoliticalRiskMember" xlink:label="loc_zackMarketDisruptionAndGeopoliticalRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackMarketDisruptionAndGeopoliticalRiskMember" xlink:type="arc" order="140" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_GrowthStockRiskMember" xlink:label="loc_zackGrowthStockRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackGrowthStockRiskMember" xlink:type="arc" order="150" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ConcentrationRiskMember" xlink:label="loc_zackConcentrationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackConcentrationRiskMember" xlink:type="arc" order="160" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_FundInvestingRiskMember" xlink:label="loc_zackFundInvestingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackFundInvestingRiskMember" xlink:type="arc" order="170" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EtfInvestingRiskMember" xlink:label="loc_zackEtfInvestingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEtfInvestingRiskMember" xlink:type="arc" order="180" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ControlOfUnderlyingFundsRiskMember" xlink:label="loc_zackControlOfUnderlyingFundsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackControlOfUnderlyingFundsRiskMember" xlink:type="arc" order="190" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_CashAndCashEquivalentsRiskMember" xlink:label="loc_zackCashAndCashEquivalentsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackCashAndCashEquivalentsRiskMember" xlink:type="arc" order="200" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_USGovernmentSecuritiesRiskMember" xlink:label="loc_zackUSGovernmentSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackUSGovernmentSecuritiesRiskMember" xlink:type="arc" order="210" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_NotIndividuallyRedeemableMember" xlink:label="loc_zackNotIndividuallyRedeemableMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackNotIndividuallyRedeemableMember" xlink:type="arc" order="220" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_TradingIssuesMember" xlink:label="loc_zackTradingIssuesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackTradingIssuesMember" xlink:type="arc" order="230" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_CashPurchasesMember" xlink:label="loc_zackCashPurchasesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackCashPurchasesMember" xlink:type="arc" order="240" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_MarketPriceVarianceRisMember" xlink:label="loc_zackMarketPriceVarianceRisMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackMarketPriceVarianceRisMember" xlink:type="arc" order="250" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_PortfolioTurnoverRiskMember" xlink:label="loc_zackPortfolioTurnoverRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackPortfolioTurnoverRiskMember" xlink:type="arc" order="260" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_NonUSSecuritiesRiskMember" xlink:label="loc_zackNonUSSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackNonUSSecuritiesRiskMember" xlink:type="arc" order="270" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_CurrencyRiskMember" xlink:label="loc_zackCurrencyRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackCurrencyRiskMember" xlink:type="arc" order="280" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_DepositaryReceiptsRiskMember" xlink:label="loc_zackDepositaryReceiptsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackDepositaryReceiptsRiskMember" xlink:type="arc" order="290" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_OpenAndClosedendFundInvestingRiskMember" xlink:label="loc_zackOpenAndClosedendFundInvestingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackOpenAndClosedendFundInvestingRiskMember" xlink:type="arc" order="300" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_MarketPriceVarianceRiskMember" xlink:label="loc_zackMarketPriceVarianceRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackMarketPriceVarianceRiskMember" xlink:type="arc" order="310" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EquityRiskMember" xlink:label="loc_zackEquityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEquityRiskMember" xlink:type="arc" order="320" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ForeignInvestmentRiskMember" xlink:label="loc_zackForeignInvestmentRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackForeignInvestmentRiskMember" xlink:type="arc" order="330" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_GrowthorientedInvestmentStrategiesRiskMember" xlink:label="loc_zackGrowthorientedInvestmentStrategiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackGrowthorientedInvestmentStrategiesRiskMember" xlink:type="arc" order="340" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ValueorientedInvestmentStrategiesRiskMember" xlink:label="loc_zackValueorientedInvestmentStrategiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackValueorientedInvestmentStrategiesRiskMember" xlink:type="arc" order="350" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_LendingPortfolioSecuritiesRiskMember" xlink:label="loc_zackLendingPortfolioSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackLendingPortfolioSecuritiesRiskMember" xlink:type="arc" order="360" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ManagementAndStrategyRiskMember" xlink:label="loc_zackManagementAndStrategyRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackManagementAndStrategyRiskMember" xlink:type="arc" order="370" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_IncomeAndDistributionRiskMember" xlink:label="loc_zackIncomeAndDistributionRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackIncomeAndDistributionRiskMember" xlink:type="arc" order="380" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_MarketCapitalizationRiskMember" xlink:label="loc_zackMarketCapitalizationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackMarketCapitalizationRiskMember" xlink:type="arc" order="390" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_SectorFocusRiskMember" xlink:label="loc_zackSectorFocusRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackSectorFocusRiskMember" xlink:type="arc" order="400" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_SmallcapCompaniesRiskMember" xlink:label="loc_zackSmallcapCompaniesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackSmallcapCompaniesRiskMember" xlink:type="arc" order="410" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_ShortSalesRiskMember" xlink:label="loc_zackShortSalesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackShortSalesRiskMember" xlink:type="arc" order="420" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_DividendPayingSecuritiesRiskMember" xlink:label="loc_zackDividendPayingSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackDividendPayingSecuritiesRiskMember" xlink:type="arc" order="430" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_PreferredStockRiskMember" xlink:label="loc_zackPreferredStockRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackPreferredStockRiskMember" xlink:type="arc" order="440" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_EtfRiskMember" xlink:label="loc_zackEtfRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackEtfRiskMember" xlink:type="arc" order="450" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_WarrantsAndRightsRiskMember" xlink:label="loc_zackWarrantsAndRightsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_zackWarrantsAndRightsRiskMember" xlink:type="arc" order="460" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CoregistrantOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000066608Member" xlink:label="loc_zackS000066608Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000066608Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000087747Member" xlink:label="loc_zackS000087747Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000087747Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000081958Member" xlink:label="loc_zackS000081958Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000081958Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000093685Member" xlink:label="loc_zackS000093685Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000093685Member" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000081339Member" xlink:label="loc_zackS000081339Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000081339Member" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000081341Member" xlink:label="loc_zackS000081341Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000081341Member" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_S000081340Member" xlink:label="loc_zackS000081340Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_zackS000081340Member" xlink:type="arc" order="60" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="loc_oefShareClassDomain" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000214795Member" xlink:label="loc_zackC000214795Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000214795Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000253655Member" xlink:label="loc_zackC000253655Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000253655Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000245117Member" xlink:label="loc_zackC000245117Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000245117Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000262121Member" xlink:label="loc_zackC000262121Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000262121Member" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000244046Member" xlink:label="loc_zackC000244046Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000244046Member" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000244050Member" xlink:label="loc_zackC000244050Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000244050Member" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000244049Member" xlink:label="loc_zackC000244049Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000244049Member" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000244048Member" xlink:label="loc_zackC000244048Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000244048Member" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_C000244047Member" xlink:label="loc_zackC000244047Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_zackC000244047Member" xlink:type="arc" order="80" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_PerformanceMeasureDomain" xlink:label="loc_oefPerformanceMeasureDomain" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell3000IndexMember" xlink:label="loc_zackRussell3000IndexMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell3000IndexMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell3000IndexReflectsNoDeductionsForEeesExpensesOrTaxesMember" xlink:label="loc_zackRussell3000IndexReflectsNoDeductionsForEeesExpensesOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell3000IndexReflectsNoDeductionsForEeesExpensesOrTaxesMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell3000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:label="loc_zackRussell3000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell3000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell2000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:label="loc_zackRussell2000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell2000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell1000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:label="loc_zackRussell1000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell1000IndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="zack-20260330.xsd#zack_Russell1000ValueIndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:label="loc_zackRussell1000ValueIndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_zackRussell1000ValueIndexReflectsNoDeductionsForFeesExpensesOrTaxesMember" xlink:type="arc" order="50" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/HoldingAssetCategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/MaturityOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other2CategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SalesLoadOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/HoldingMeasureOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ValueMeasureOnly" />
</link:linkbase>
