English Explanatory Dictionary

invalidate

English dictionary entry

Meanings

verb
  1. To make invalid. Especially applied to contract law.
  2. To make or declare (an argument, statement, or theory) unsound or erroneous; disprove.
  3. To render invalid; discredit.

Pronunciation

/ɪnˈvæl.ɪ.deɪt/ /ɪnˈvæl.əˌdeɪt/ LL-Q1860 (eng)-Vininn126-invalidate.wav /ɪnˈvæl.ə.dæɪt/

Word forms

invalidate invalidates invalidating invalidated

Etymology

First attested in 1649; borrowed from Middle French invalider, from invalide + -er. By surface analysis, in- + validate or invalid + -ate.

Synonyms

disprove vitiate negate extinguish

Antonyms

validate

Derived words

invalidator microinvalidate
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