Duel
A duel was an event where two opponents agree to engage in combat against each other. One who participated in a duel was called a duelist. The victor was often the one who was unscathed or generally in a better position than the opponent at the end of the event. Some duels were to the death. 

Duels were also common with other species, including the Andorian Ushaan , the Vulcan Kal-if-fee and most notably the Klingon Right of Vengeance. (; ; ; )

The Earth astronomer Tycho Brahe lost his nose in a duel over a math equation. ()

James T. Kirk once maintained that "the Klingon Empire has maintained a dueling tradition. They think they can beat us with swords." () 

Kirk and Trelane, the Squire of Gothos, battled each other in a duel of guns. Later, they used swords. ()

Ogus II had arcades which offered recreational laser duels. ()

In the 24th century, Frenchmen, like Jean-Luc Picard, used fencing to duel. He invited Guinan to participate in a duel, and she promptly defeated Picard using a fake wounded tactic. ()

In 2399 on Vashti, the former Romulan Senator Tenqem Adrev challenged Jean-Luc Picard to a duel outside the Romulan Social Club. Though Picard parried Adrev's first thrust, he then threw his sword aside and refused to fight further. The duel was ended by Elnor, who offered Adrev a chance to back down and slew him when he refused. ()

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