- 1nullify something to make something such as an agreement or order lose its legal force synonym invalidate Judges were unwilling to nullify government decisions.
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- 2nullify something to make something lose its effect or power synonym negate An unhealthy diet will nullify the effects of training.
nullify
verbNAmE//ˈnʌləˌfaɪ//
(formal)Verb Forms present simple I / you / we / they nullify he / she / it nullifies
past simple nullified
-ing form nullifying
See nullify in the Oxford Advanced Learner's Dictionary
Check pronunciation: nullify