"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.
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