What is the meaning of Opponent?

One who opposes another; one who works or takes a position against someone or something; one who attempts to stop the progress of someone or something.

One who opposes another physically (in a fight, sport, game, or competition).

One who opposes another in words (in a dispute, argument or controversy).

One who is opposed or objects (to a policy, course of action or set of ideas).

The participant who opens an academic debate by putting forward objections to a theological or philosophical thesis.

Opposing; adverse; antagonistic.

Situated in front; opposite.

third-person plural future active indicative of oppōnō

Source: wiktionary.org