1. Four performers or singers who perform together
   - quartet 
2. A set of four similar things considered as a unit
   - quartet, quadruplet, quadruple 
3. Four people considered as a unit
   - quartet, foursome 
4. A musical composition for four performers
   - quartet

Derived forms: quartettes

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

Encyclopedia: Quartette

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