'Duo' definitions:

Definition of 'duo'

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

Definition of 'Duo'

From: GCIDE
  • Duo \Du"o\, n. [It. duo, fr. L. duo two. See Duet.] (Mus.) A composition for two performers; a duet. Duodecahedral

Synonyms of 'duo'

From: Moby Thesaurus