[n] a musical composition for four performers
[n] four people considered as a unit; "he joined a barbershop quartet"; "the foursome teed off before 9 a.m."
[n] a set of four similar things considered as a unit
[n] four performers or singers who perform together
[n] the cardinal number that is the sum of three and one
4, four, foursome, foursome, IV, Little Joe, quadruplet, quadruplet, quartette, quartette, quatern, quaternary, quaternion, quaternity, tetrad