WordWeb Online

1. Two items of the same kind
   - couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duet, dyad, duad
    
2. Two performers or singers who perform together
   - duet, duette
    
3. A pair who associate with one another
   "the engaged duo";
   - couple, twosome, duet
    
4. A musical composition for two performers
   - duet, duette

Derived forms: dui, duos

Type of: 2, composition, deuce, II, musical composition, musical group, musical organisation [Brit], musical organization, opus, pair, piece, piece of music, two

Encyclopedia: Duo Duo, West Virginia