An adversary is generally considered to be a person, group, or force that opposes and/or attacks. Adversary may also refer to: * Satan ("adversary" in Hebrew), in Judeo-Christian religion

Entertainment

Fiction

Adversary (comics) The Adversary is a fictional character, a demonic supervillain appearing in American comic books published by Marvel Comics. Publication history The Adversary first appeared in ''Uncanny X-Men'' #187-188 (November-December 1984), and was creat ...

, 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, that features animals, legendary creatures, plants, inanimate objects, or forces of nature that are anthropomorphized, and that illustrates or leads to a particular moral ...

Music

Ad·ver·sary Ad·ver·sary is an industrial music project fronted by Jairus Khan, based in Toronto, Ontario, Canada. History In 2005, after working as a DJ, Khan released his first EP, ''Cyanotic vs Ad·ver·sary - Music For Jerks'', as Ad·ver·sary. He late ...

, 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 An adversary proceeding in bankruptcy is a type of lawsuit in the American legal system. It is distinguished from other suits by being filed a United States bankruptcy court in connection with a larger bankruptcy proceeding. Procedure Adversary pr ...

, 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 computer science, an online algorithm measures its competitiveness against different adversary models. For deterministic algorithms, the adversary is the same as the adaptive offline adversary. For randomized online algorithms competitiveness ca ...

, in online algorithms, used to show competitiveness of randomized algorithms

Other

Adversarial purchasing An adversarial relationship in purchasing and supply arises when identical or equivalent good or services are available from competing suppliers and buyers/sellers are trying to gain an advantage over each other. Low levels of trust are characterist ...

, in business strategic management