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quadruplet (n.)

"one of four children at a single birth," 1787; from quadruple (adj.) with ending from triplet. Related: Quadruplets. Meaning "any combination of four objects or parts grouped, united, or acting together" is by 1852. Musical sense of "group of four notes to be played in the time of three notes" is by 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