An adversary is an enemy or someone who opposes someone else. In tennis, you stand across the net from your adversary.

Adversary is related to the word adverse, meaning "against or contrary" —so think of an adversary as someone whom you are fighting against. If you're the undefeated chess champion, you have bested every single one of your adversaries. The word adversary is from Middle English adversarie, from Latin adversarius, from adversus "against."

Definitions of adversary
  1. noun
    someone who offers opposition
    synonyms: antagonist, opponent, opposer, resister
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    someone involved in a contest or battle (as in an agon)
    (Christianity) the adversary of Christ (or Christianity) mentioned in the New Testament; the Antichrist will rule the world until overthrown by the Second Coming of Christ
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    dueler, duelist, dueller, duellist
    a person who fights duels
    enemy, foe, foeman, opposition
    an armed adversary (especially a member of an opposing military force)
    any opponent of technological progress
    an opponent who resists with force or resolution
    an enemy who lays siege to your position
    type of:
    individual, mortal, person, somebody, someone, soul
    a human being
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