Merriam-Webster Online Dictionary

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One entry found for invalidate.
Main Entry: in·val·i·date
Pronunciation: (")in-'va-l&-"dAt
Function: transitive verb
Date: 1649
: to make invalid; especially : to weaken or destroy the cogency of
synonym see NULLIFY
- in·val·i·da·tion /-"va-l&-'dA-sh&n/ noun
- in·val·i·da·tor /in-'va-l&-"dA-t&r/ noun