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1. The cardinal number that is the sum of three and one
   - four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quadruplet, foursome, Little Joe
    
2. Four performers or singers who perform together
   - quartette
    
3. A set of four similar things considered as a unit
   - quartette, quadruplet, quadruple
    
4. Four people considered as a unit
   "he joined a barbershop quartet";
   - quartette, foursome
    
5. A musical composition for four performers
   - quartette

Derived forms: quartets

Type of: assemblage, composition, digit, figure, gathering, musical composition, musical group, musical organisation [Brit], musical organization, opus, piece, piece of music, set

Encyclopedia: Quartet