opponent Definition

opponent
noun

1. Someone who belongs to the opposing side in an argument, contest or battle, etc.

Thesaurus: rival, adversary, challenger, competitor, contestant, contender, opposition, antagonist, enemy, foe, litigant; Antonym: supporter, defender.

adj

1. Opposed; contrary.
2. Opposite in position; opposing.

Derivative: opponency
noun

Etymology: 16c: from Latin opponens, opponentis setting before or against, from op- in the way of + ponere to place.