#1 duet n. [couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, dyad, duad] two items of the same kind. wn
#2 duet n. [duette, duo] two performers or singers who perform together. wn
#3 duet n. [couple, twosome, duo] a pair who associate with one another; "the engaged couple"; "an inseparable twosome". wn
#4 duet n. [duette, duo] a musical composition for two performers. wn
#5 duet n. [pas de deux] (ballet) a dance for two people (usually a ballerina and a danseur noble). wn
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