collateral
kuh-LAT-er-uhl · adjective
Origin
Recorded in English since around 1378, from Old French, from Medieval Latin collaterālis, from Latin col- ("together with") plus the stem of latus ("side").
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Related words
It shares its second root, the Latin stem of latus ("side"), with the plain adjective "lateral" — collateral is essentially "lateral" with "together" bolted on the front.