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invalidate

[in-val-i-deyt]
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verb (used with object), in·val·i·dat·ed, in·val·i·dat·ing.
  1. to render invalid; discredit.
  2. to deprive of legal force or efficacy; nullify.

Origin of invalidate

First recorded in 1640–50; invalid2 + -ate1
Related formsin·val·i·da·tion, nounin·val·i·da·tor, noun

Synonyms

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1. weaken, impair; disprove, refute, rebut.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for invalidate

invalidate

verb (tr)
  1. to render weak or ineffective, as an argument
  2. to take away the legal force or effectiveness of; annul, as a contract
Derived Formsinvalidation, nouninvalidator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for invalidate

v.

1640s, from invalid + -ate (2). Related: Invalidated; invalidating.

Online Etymology Dictionary, © 2010 Douglas Harper