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quintuplet (n.)

1873, "set of five things" (originally in music), from quintuple (adj.) with ending from triplet. In plural, "five children at one birth" it is recorded from 1889.

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Definitions of quintuplet from WordNet

quintuplet (n.)
a set of five similar things considered as a unit;
Synonyms: quintet / quintette / quintuple
quintuplet (n.)
the cardinal number that is the sum of four and one;
Synonyms: five / " / v / cinque / quint / quintet / fivesome / pentad / fin / Phoebe / Little Phoebe
quintuplet (n.)
one of five children born at the same time from the same pregnancy;
Synonyms: quint / quin
From wordnet.princeton.edu