Definition of adversary noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈædvəsəri//
; NAmE NAmE//ˈædvərseri//
(pl. adversaries) (formal)
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a person that somebody is opposed to and competing with in an argument or a battle synonym opponent his old political adversary The British considered him a worthy adversary. The two of them were old adversaries. Word OriginMiddle English: from Old French adversarie, from Latin adversarius ‘opposed, opponent’, from adversus ‘against, opposite’, past participle of advertere, from ad- ‘to’ + vertere ‘to turn’.
See the Oxford Advanced American Dictionary entry: adversary