[doo-oh, dyoo-oh]

noun, plural du·os.

Music. duet.
two persons commonly associated with each other; couple.
two animals or objects of the same sort; two things ordinarily placed or found together; a pair: a duo of lovebirds.

Origin of duo

1580–90; < Italian < Latin: two


a combining form meaning “two,” used in the formation of compound words: duologue.

Origin of duo-

combining form of Greek dýo, Latin duo two
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for duo

Contemporary Examples of duo

Historical Examples of duo

  • I heard every note, and thought the trees and the brook were enjoying a duo, and—Bon Dieu!


    James Huneker

  • It had been singing with her the duo of which lightly she had spoken.

    The Paliser case

    Edgar Saltus

  • The Duo scrubbed each other daily in—a biscuit tin of water.

    Norman Ten Hundred

    A. Stanley Blicq

  • Duo would have had him driven away, but Suo felt compassion for him.

  • Duo was very willing to do this; she had no longer any use for them.

British Dictionary definitions for duo


noun plural duos or dui (ˈdjuːiː)

  1. a pair of performers
  2. another word for duet
a pair of actors, entertainers, etc
informal a pair of closely connected individuals

Word Origin for duo

C16: via Italian from Latin: two


combining form

indicating twoduotone

Word Origin for duo-

from Latin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for duo

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

Online Etymology Dictionary, © 2010 Douglas Harper