duo (noun)
1: two items of the same kind [syn: couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duet, dyad, duad]
2: two performers or singers who perform together [syn: duet, duette]
3: a pair who associate with one another; "the engaged couple"; "an inseparable twosome" [syn: couple, twosome, duet]
4: a musical composition for two performers [syn: duet, duette]