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

Satan Satan, also known as the Devil, is a devilish entity in Abrahamic religions who seduces humans into sin (or falsehood). In Judaism, Satan is seen as an agent subservient to God, typically regarded as a metaphor for the '' yetzer hara'', or ' ...

("adversary" in Hebrew), in Abrahamic religions

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 defined as 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 ...

Music

* Ad·ver·sary, Canadian industrial musician

Law

Adversarial system The adversarial system (also adversary system, accusatorial system, or accusatory 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 peopl ...

, 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 in a United States bankruptcy court in connection with a larger bankruptcy proceeding. Procedure Advers ...

, proceeding used in bankruptcy processes

Science

* Adversarial collaboration, a scientific experiment

Computer science

Adversary (cryptography) In cryptography, an adversary (rarely opponent, enemy) is an entity whose aim is to prevent the users of the cryptosystem from achieving their goal (primarily privacy, integrity, and availability of data), often with malicious intent. An adversary ...

, 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 * Adversarial alignment, when an adversarial users constructs inputs that bypass AI alignment

Other

* Adversarial purchasing, in business strategic management