Look up adversary or Adversary in Wiktionary, the free dictionary.

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 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

Music

• Ad·ver·sary, Canadian industrial musician

Law

• Adversarial system, 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