Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: averer, from Medieval Latin adverare 'to show to be true', from Latin ad- 'to' + verus 'true'

aver

verb
     
a‧ver past tense and past participle averred, present participle averring [transitive]
formal to say something firmly and strongly because you are sure that it is true [= declare]

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