Foursome - Definition

n 1: four people considered as a unit; "he joined a barbershop
quartet"; "the foursome teed off before 9 a.m." [syn:
quartet, quartette, foursome]
2: the cardinal number that is the sum of three and one [syn:
four, 4, IV, tetrad, quatern, quaternion,
quaternary, quaternity, quartet, quadruplet,
foursome, Little Joe]