a prearranged combat with deadly weapons between two people following a formal procedure in the presence of seconds and traditionally fought until one party was wounded or killed, usually to settle a quarrel involving a point of honour
a contest or conflict between two persons or parties
late 15c., from M.L. duellum "combat between two persons," by association with L. duo "two," but originally from L. duellum "war," an Old Latin form of bellum. Retained in poetic and archaic language and apparently given a special meaning in M.L. or L.L. of "one-on-one combat" on fancied connection with duo "two." Related: Dueling.