A person, group, or force that opposes or attacks; opponent; enemy; foe. In the chess tournament, he faced a formidable adversary who had won several championships.
A person, group, etc., that is an opponent in a contest; contestant. The team prepared extensively to face their adversary in the final match.
(usually capitalized) The Devil; Satan—regarded as the principal evil being in Christian theology. In the Book of Job, the Adversary questions Job’s faithfulness before God.