invalidate

[ in-val-i-deyt ]
See synonyms for invalidate on Thesaurus.com
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

1
First recorded in 1640–50; invalid2 + -ate1

Other words for invalidate

Other words from invalidate

  • in·val·i·da·tion, noun
  • in·val·i·da·tor, noun

Words Nearby invalidate

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use invalidate in a sentence

  • Here and there roving parties appeared, but having no recognized leaders, their existence did not invalidate the treaty.

    The Philippine Islands | John Foreman
  • A foreign patent in order to invalidate an American patent must antedate the invention patented.

  • He has indeed fought the letter, and perhaps come off victorious; but does he invalidate its spirit?

    The Way to Abolish Slavery | Charles Stearns
  • Provided, that no omission of any of the foregoing duties on the part of an Umpire shall of itself invalidate a game or match.

  • This does not by any means invalidate the idea that Voice Culture is properly a subject for scientific regulation.

    The Psychology of Singing | David C. Taylor

British Dictionary definitions for invalidate

invalidate

/ (ɪnˈvælɪˌdeɪt) /


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 forms of invalidate

  • invalidation, noun
  • invalidator, 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