WordNet (r) 3.0 (2006):
twosome n 1: two items of the same kind [syn: couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad] 2: a pair who associate with one another; "the engaged couple"; "an inseparable twosome" [syn: couple, twosome, duo, duet]