quar·tet 
/kwoɚˈtɛt/ noun
plural quar·tets /kwoɚˈtɛt/ noun [count] 1 : a group of four singers or musicians who perform together
▪ He is a member of a jazz quartet. 2 : a song or piece of music performed by four singers or musicians
▪ a string quartet by Beethoven 3 : a group or set of four people or things
▪ The author wrote a quartet of novels about the same character.
▪ He is a member of a jazz quartet.
▪ a string quartet by Beethoven
▪ The author wrote a quartet of novels about the same character.
