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'Adversary' may refer to:
In 'religion'

★ Satan, whose name means adversary in the Hebrew language.
In 'computer science':

★ Adversary (cryptography), malicious entity in cryptography whose aim is to prevent the users of the cryptosystem from achieving their goal.

★ Adversary (online algorithm), the adversary model is used in online algorithms in order to show competitiveness of randomized algorithms.
In 'fiction':

★ Adversary (comics), villain from the Marvel comics universe

★ The Adversary, the main villain in the ''Fables'' comic book series

★ "The Adversary" (''DS9'' episode), the season finale of ''Star Trek: Deep Space Nine's third season
In 'music':

★ ''Ad·ver·sary'', Industrial band from Ottawa, Canada

★ ''The Adversary'' (album), solo album by Ihsahn of influential Norwegian black metal band ''Emperor''

★ The Adversary (webzine), webzine specializing in extreme metal chaos - www.theadversary.org
In 'law':

★ Adversarial system, a system of law commonly used in common-law countries

★ Adversary proceeding, proceeding used in bankruptcy processes