An adversary is someone who fights against or opposes another. In tennis, you stand across the net from your adversary.

  • Pronunciation: /ˈædvəsəri/
  • English Description: a country or person you are fighting or competing against

STORY: Adversary as in "enemy" or "opponent" is related to the words adversarial, or hostile, or adverse, meaning against or contrary. The Adversary is a specific reference to Satan, or the Devil. The word adversary is from Middle English adversarie, from Latin adversarius, from adversus "against."