An adversary is generally considered to be a person, group, or force that opposes and/or attacks. Adversary may also refer to: *

Satan Satan,, ; grc, ὁ σατανᾶς or , ; ar, شيطانالخَنَّاس , also known as the Devil, and sometimes also called Lucifer in Christianity, is an entity in the Abrahamic religions that seduces humans into sin or falsehoo ...

("adversary" in Hebrew), in Judeo-Christian religion

Entertainment

Fiction

* Adversary (comics), villain from the Marvel comics universe * The mysterious antagonist who invaded the homelands in the comic book series ''

Fables Fable is a literary genre: a succinct fictional story, in prose or verse (poetry), verse, that features animals, legendary creatures, plants, inanimate objects, or forces of nature that are Anthropomorphism, anthropomorphized, and that illustrat ...

Music

* Ad·ver·sary, Canadian industrial musician

Law

Adversarial system The adversarial system or adversary system is a legal system used in the common law countries where two advocates represent their parties' case or position before an impartial person or group of people, usually a judge or jury, who attempt to det ...

, a system of law commonly used in common-law countries * Adversary proceeding, proceeding used in bankruptcy processes

Science

* Adversarial collaboration, a scientific experiment

Computer science

* Adversary (cryptography), a malicious entity in cryptography whose aim is to prevent the users of the cryptosystem from achieving their goal * Adversary model, in online algorithms, used to show competitiveness of randomized algorithms

Other

* Adversarial purchasing, in business strategic management