invalidate

(in valə dāt′)

transitive verb invalidated, invalidating

to make invalid; deprive of legal force

Origin: invalid + -ate

Related Forms:

See invalidate in American Heritage Dictionary 4

transitive verb in·val·i·dat·ed, in·val·i·dat·ing, in·val·i·dates
To make invalid; nullify.

Related Forms:

  • in·valˌi·daˈtion noun
  • in·valˈi·daˌtor noun

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