Etymology
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quintuplet (n.)

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

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Definitions of quintuplet

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