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quadruplet (n.)

"one of four children at a single birth," 1787; from quadruple (adj.) with ending from triplet. Related: Quadruplets. Musical sense is from 1873.

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Definitions of quadruplet from WordNet

quadruplet (n.)
the cardinal number that is the sum of three and one;
Synonyms: four / " / iv / tetrad / quatern / quaternion / quaternary / quaternity / quartet / foursome / Little Joe
quadruplet (n.)
a set of four similar things considered as a unit;
Synonyms: quartet / quartette / quadruple
quadruplet (n.)
one of four children born at the same time from the same pregnancy;
Synonyms: quad
From wordnet.princeton.edu