[kwin-tuhp-lit, -too-plit, -tyoo-, kwin-too-plit, -tyoo-]
any group or combination of five, especially of the same kind.
quintuplets, five children or offspring born of one pregnancy.
one of five such children or offspring.
Music. a group of five notes of equal value performed in the time normally taken for four.

1870–75; quintuple + -et

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World English Dictionary
quintuplet (ˈkwɪntjʊplɪt, kwɪnˈtjuːplɪt)
1.  a group or set of five similar things
2.  Often shortened to: quin one of five offspring born at one birth
3.  music a group of five notes to be played in a time value of three, four, or some other value

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1873, "set of five things" (originally in music), from quintuple (adj.), 1570, from M.Fr. quintuple, from L. quintus "fifth." In plural, "five children at one birth" it is recorded from 1889.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

quintuplet quin·tu·plet (kwĭn-tŭp'lĭt, -tōō'plĭt, -tyōō'-, kwĭn'tə-plĭt)

  1. One of five offspring born in a single birth.

  2. A group or combination of five associated by common properties or behavior.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The pair of space-time diagrams above show quintuplets separated at birth.
Later he marries the sister of the actress who bears him quintuplets.
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