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1. A close-fitting jacket, with or without sleeves, worn by European men from the late 1300s to around 1650.
a. A pair of similar or identical things.
b. A member of such a pair.
c. Physics A multiplet with two members.
3. Linguistics One of two words derived from the same historical source by different routes of transmission, such as skirt from Scandinavian and shirt from English.
4. An imitation gem composed of two parts, as of an inferior stone layered beneath a precious gem.
5. doublets Games A throw of two dice in which the same number of dots appears on the upper face of each.
[Middle English, from Old French, diminutive of double, double; see double.]
1. (Clothing & Fashion) (formerly) a man's close-fitting jacket, with or without sleeves (esp in the phrase doublet and hose)
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) 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. (General Physics) physics
a. a multiplet that has two members
b. a closely spaced pair of related spectral lines
5. (Games, other than specified) (plural) two dice each showing the same number of spots on one throw
6. (General Physics) 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]
1. a close-fitting jacket, sleeved or sleeveless, sometimes with a short skirt, worn by men in the Renaissance.
2. a pair of like things; couple.
3. one of a pair of like things; duplicate.
4. a unit composed of two closely or identically matched pieces, as an artificial gem.
5. one of two or more words in a language that are derived from the same source, esp. through different routes, as coy and quiet, both taken from the same Latin word, quiet directly and coy by way of Old French.
6. doublets, a throw of a pair of dice in which the same number of spots turns up on each die.
7. a compound lens made of two thin lenses shaped so as to reduce chromatic and spherical aberrations.