n. A single combat; specifically, a premeditated and prearranged combat between two persons with deadly weapons, and usually in the presence of at least two witnesses, called seconds, for the purpose of deciding a quarrel, avenging an insult, or clearing the honor of one of the combatants, or of some third party whose cause he champions.n. Any fight or contest between two parties; especially, a military contest between parties representing the same arm of the service.