Etymology
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duet (n.)

"musical composition for two voices or instruments," 1740, from French duet, from Italian duetto "short musical composition for two voices," diminutive of duo "two" (from PIE root *dwo- "two"). The Italian form of the noun was used in English from c. 1724. As a verb, "to perform a duet," from 1822.  Duettino "short, unpretentious duet" is by 1839.

updated on October 16, 2018

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Definitions of duet from WordNet

duet (n.)
two items of the same kind;
Synonyms: couple / pair / twosome / twain / brace / span / yoke / couplet / distich / duo / dyad / duad
duet (n.)
two performers or singers who perform together;
Synonyms: duette / duo
duet (n.)
a pair who associate with one another;
Synonyms: couple / twosome / duo
duet (n.)
a musical composition for two performers;
Synonyms: duette / duo
duet (n.)
(ballet) a dance for two people (usually a ballerina and a danseur noble);
Synonyms: pas de deux
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.