Quadruplet

n.	1.	A collection or combination of four of a kind.
	2.	Four children born in the same labor.
	3.	A cycle for carrying four riders, so arranged that all the riders can assist in the propulsion.

Noun	1.	quadruplet - the cardinal number that is the sum of three and one Synonyms: IV, Little Joe, quartet, quatern, 4, four, quaternion, quaternity, tetrad, foursome, quaternary
	2.	quadruplet - one of four children born at the same time from the same pregnancy Synonyms: quad
	3.	quadruplet - a set of four similar things considered as a unit Synonyms: quartette, quartet

4, digit, figure, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad