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Pronunciation:  in'vali`deyt

WordNet Dictionary
  1. [v]  take away the legal force of or render ineffective; "invalidateas a contract"
  2. [v]  show to be invalid
  3. [v]  of cheques or tickets
  4. [v]  declare invalid; "The contract was annulled"; "avoid a plea"

INVALIDATE is a 10 letter word that starts with I.


 Synonyms: annul, avoid, cancel, nullify, nullify, quash, vitiate, void, void
 Antonyms: formalise, formalize, validate, validate, validate
 See Also: alter, break, cancel, change, contradict, mark, negate, score, stet, strike down



Webster's 1913 Dictionary
\In*val"i*date\, v. t. [imp. & p. p. {Invalidated};
p. pr. & vb. n. {Invalidating}.] [From {Invalid} null.]
To render invalid; to weaken or lessen the force of; to
destroy the authority of; to render of no force or effect; to
overthrow; as, to invalidate an agreement or argument.

Thesaurus Terms
 Related Terms: 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