Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Medieval Latin
Origin: collateralis, from Latin com- ( COM-) + lateralis ( LATERAL)

collateral

2 adjective
     
collateral2 [only before noun]
1

collateral damage

people who are hurt or killed, or property that is damaged accidentally in a war - used especially by the army, navy etc:
Hitting any non-military targets would risk 'collateral damage'.
2 relating to something or happening as a result of it, but not as important:
There may be collateral benefits to the scheme.
3SSF collateral relatives are members of your family who are not closely related to you

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