Etymology
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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.

updated on February 23, 2021

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