Disputant (noun)

1. A person engaged in a dispute or argument.
2. A person who takes part in a formal argument or debate.

Origin:

Early 17th century; earliest use found in a latin form of the word in john foxe's acts and monuments. from latin disputant-, disputans, present participle of disputare to dispute.

Examples:

1. The two disputants presented their respective positions in the debate.
2. The disputants argued their case before the court.
3. The disputants were unable to reach a resolution despite many hours of discussion.
4. The disputants were both well-informed and passionate about their beliefs.
5. The disputants showed mutual respect despite the intense disagreement.