|Origin:||, present participle of opponere; OPPOSE|
op‧po‧nent W3 [countable]
someone who you try to defeat in a competition, game, fight, or argument:
Graf's opponent in today's final will be Sukova.
During the primary elections, McCain was Bush's leading opponent.
In debate he was a formidable opponent.
He is admired even by his political opponents.