Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: , past participle of negare 'to say no', from neg- 'no, not'

negate

 verb
     
ne‧gate [transitive] formal
1 to prevent something from having any effect:
Efforts to expand the tourist industry could be negated by reports that the sea is highly polluted.
2 to state that something does not exist or is untrue [= deny]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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