opponent

One that opposes another or others, as in a battle, contest, or debate.

One who is hostile to an idea or cause.

Acting against an antagonist or opposing force.

Situated in front; opposite; standing in the way.

Opposing; antagonistic; adverse.

In anatomy, bringing together or into opposition; having the action of an opponens. See opponens.

One who opposes; an adversary; an antagonist; one who supports the opposite side in controversy, disputation, or argument, or in a contest of any kind.

One who takes part in an opponency; the person who begins a dispute by raising objections to a tenet or doctrine: correlative to defendant or respondent.

Situated in front; opposite; hence, opposing; adverse; antagonistic.

One who opposes; an adversary; an antagonist; a foe.