a close-fitting outer garment, with or without sleeves and sometimes having a short skirt, worn by men in the Renaissance.
an undergarment, quilted and reinforced with mail, worn beneath armor.
a pair of like things; couple.
one of a pair of like things; duplicate.
Linguistics. one of two or more words in a language that are derived from the same source, especially when one is learned while the other is popular, as coy and quiet, both taken from the same Latin word, quiet directly, and coy by way of Old French.
Printing. an unintentional repetition in printed matter or proof.
doublets, a throw of a pair of dice in which the same number of spots turns up on each die.
Jewelry. a counterfeit gem made of two pieces, either of smaller gemstones, inferior stones, or glass. Compare imitation doublet, triplet ( def 6 ).
Optics. a compound lens made of two thin lenses shaped so as to reduce chromatic and spherical aberrations.

1300–50; Middle English < Middle French. See double, -et Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doublet (ˈdʌblɪt)
1.  (formerly) a man's close-fitting jacket, with or without sleeves (esp in the phrase doublet and hose.)
2.  a.  a pair of similar things, esp two words deriving ultimately from the same source, for example reason and ratio or fragile and frail
 b.  one of such a pair
3.  jewellery a false gem made by welding a thin layer of a gemstone onto a coloured glass base or by fusing two small stones together to make a larger one
4.  physics
 a.  a multiplet that has two members
 b.  a closely spaced pair of related spectral lines
5.  (plural) two dice each showing the same number of spots on one throw
6.  physics two simple lenses designed to be used together, the optical distortion in one being balanced by that in the other
[C14: from Old French, from double]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c. as a type of mens garment, from Fr. doublet (12c.), from O.Fr. dim. of duble (see double). From 1550s as one of two things that are alike.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

doublet dou·blet (dŭb'lĭt)
A pairing of two lenses to optically correct a chromatic and spherical aberration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


chief upper garment worn by men from the 15th to the 17th century. It was a close-fitting, waisted, padded jacket worn over a shirt. Its ancestor, the gipon, was a tunic worn under armour, and at first it came down almost to the knees. The civilian doublet at first had skirts but gradually lost them. It had no collar until 1540, allowing the shirt to be seen at the neck; the shirt was also visible through slashes or pinking in the material.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
His doublet had been ripped open and his buttons knocked off.
Still the two clowns, in their tattered doublet and hose, are remarkably funny
  in their limited répertoire.
To guard against this, a thick and well-stuffed doublet was worn underneath,
  under which was commonly added an iron breastplate.
Lie ten nights awake, carving the fashion of a new doublet.
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