invalidate

[ in-val-i-deyt ]
/ ɪnˈvæl ɪˌdeɪt /

verb (used with object), in·val·i·dat·ed, in·val·i·dat·ing.

to render invalid; discredit.
to deprive of legal force or efficacy; nullify.

Origin of invalidate

First recorded in 1640–50; invalid2 + -ate1

OTHER WORDS FROM invalidate

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

Example sentences from the Web for invalidation

British Dictionary definitions for invalidation

invalidate
/ (ɪnˈvælɪˌdeɪt) /

verb (tr)

to render weak or ineffective, as an argument
to take away the legal force or effectiveness of; annul, as a contract

Derived forms of invalidate

invalidation, noun invalidator, noun