quartet

Etymology

From French quartette, from Italian quartetto. Doublet of cuarteto and quartetto.

noun

1. A group of four people or things, particularly
   1. (music) A group of four musicians who perform classical music together.
      The string quartet played some chamber music.
   2. (music) A musical composition in four parts, each performed by a single voice or instrument.
      He composed a string quartet.
   3. (music) A group of four singers, usually males, who sings together in four-part harmony.
      The barbershop quartet performed the composition a capella.