[kwo-druhp-lit, -droo-plit, kwod-roo-plit]
any group or combination of four.
quadruplets, four children or offspring born of one pregnancy.
one of four such children or offspring.
Music. a group of four notes of equal value performed in the time normally taken for three.

1780–90; quadruple + -et (modeled on triplet)

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World English Dictionary
quadruplet (ˈkwɒdrʊplɪt, kwɒˈdruːplɪt)
1.  Often shortened to: quad one of four offspring born at one birth
2.  a group or set of four similar things
3.  music a group of four notes to be played in a time value of three

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American Heritage
Medical Dictionary

quadruplet quad·ru·plet (kwŏ-drŭp'lĭt, -drōō'plĭt, kwŏd'rə-plĭt)

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

  2. A group or combination of four 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
It incorporates formulations for deep water processes of wave generation, dissipation and the quadruplet wave-wave interactions.
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