invalidate

[ in-val-i-deyt ]
See synonyms for: invalidateinvalidatedinvalidatesinvalidating 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

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