AskDefine | Define invalidate

Dictionary Definition



1 declare invalid; "The contract was annulled"; "void a plea" [syn: annul, quash, void, avoid, nullify] [ant: validate]
2 of cheques or tickets [syn: cancel]
3 show to be invalid [syn: nullify] [ant: validate]
4 take away the legal force of or render ineffective; "invalidateas a contract" [syn: void, vitiate] [ant: validate]

User Contributed Dictionary



From the Latin valere meaning "to be strong". Literal derivation is "to make not strong".


  1. To make invalid. Esp. applied to contract law.
    The circuit court judge's ruling was invalidated by a superior judge.



  1. Form of Second-person plural imperative, invalidare#Italian|invalidare

Synonyms, Antonyms and Related Words

abate, abolish, abrogate, annihilate, annul, belie, blow sky-high, blow up, bring to naught, bring to nothing, buffer, cancel, cancel out, come to nothing, counterbalance, countermand, counterorder, deflate, disannul, disconfirm, discredit, disprove, disqualify, do away with, explode, expose, frustrate, make void, negate, negativate, negative, neutralize, nullify, offset, override, overrule, prove the contrary, puncture, quash, recall, recant, renege, repeal, rescind, retract, reverse, revoke, set aside, show up, stultify, suspend, thwart, undercut, undo, unfit, vacate, vitiate, void, waive, withdraw, write off
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