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duo (n.)

1580s, "song for two voices, duet," via either Italian or French from Latin duo "two" (from PIE root *dwo- "two"). Meaning "two people" (especially as an entertainment team) attested by 1887.

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Definitions of duo from WordNet

duo (n.)
two items of the same kind;
Synonyms: couple / pair / twosome / twain / brace / span / yoke / couplet / distich / duet / dyad / duad
duo (n.)
two performers or singers who perform together;
Synonyms: duet / duette
duo (n.)
a pair who associate with one another;
Synonyms: couple / twosome / duet
duo (n.)
a musical composition for two performers;
Synonyms: duet / duette
From wordnet.princeton.edu