|1.||[ noun ] four people considered as a unit|
"he joined a barbershop quartet" "the foursome teed off before 9 a.m."
|Related terms:||gathering quadrumvirate|
|2.||[ noun ] (mathematics) the cardinal number that is the sum of three and one|
|Synonyms:||four 4 quaternity quatern tetrad quaternary quaternion quartet quadruplet Little_Joe IV|