Merriam-Webster Online Dictionary

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One entry found for negate.
Main Entry: ne·gate
Pronunciation: ni-'gAt
Function: transitive verb
Inflected Form(s): ne·gat·ed; ne·gat·ing
Etymology: Latin negatus, past participle of negare to say no, deny, from neg- no, not (akin to ne- not) -- more at NO
Date: circa 1623
1 : to deny the existence or truth of
2 : to cause to be ineffective or invalid
synonym see NULLIFY
- negate noun
- ne·ga·tor /-'gA-t&r/ noun