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triplet (n.)

1650s, "three successive lines of poetry," from triple; perhaps patterned on doublet. Extended to a set of three of anything by 1733, and to three children at the same birth by 1787 (another word for this was trin, 1831, on the model of twin). Musical meaning "three notes played in the time of two" is from 1801.

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Definitions of triplet from WordNet

triplet (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / threesome / tierce / leash / troika / triad / trine / trinity / ternary / ternion / tercet / terzetto / trey / deuce-ace
triplet (n.)
one of three offspring born at the same time from the same pregnancy;
triplet (n.)
a set of three similar things considered as a unit;
Synonyms: trio / triad / triple
From wordnet.princeton.edu