duet in WordNet English dictionary

1. two items of the same kind
   couple  pair  twosome  twain  brace  span  yoke  couplet  distich  duo  duet  dyad  duad 
   
2. a pair who associate with one another
   "the engaged couple"; "an inseparable twosome"
   couple  twosome  duo  duet 
   
3. (ballet) a dance for two people (usually a ballerina and a danseur noble)
   pas de deux  duet 
   
4. a musical composition for two performers
   duet  duette  duo 
   
5. two performers or singers who perform together
   duet  duette  duo