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[jak-it] /ˈdʒæk ɪt/
a short coat, in any of various forms, usually opening down the front.
something designed to be placed around the upper part of the body for a specific purpose other than use as clothing:
a life jacket.
a protective outer covering.
the skin of a potato, especially when it has been cooked.
the cover of a paperbound book, usually bearing an illustration.
a paper or cardboard envelope for protecting a phonograph record.
a metal casing, as the steel covering of a cannon, the steel cover around the core of a bullet, or the water jacket on certain types of machine guns.
a folded paper or open envelope containing an official document.
verb (used with object)
to put a jacket on (someone or something).
Origin of jacket
late Middle English
1425-75; late Middle English jaket < Middle French ja(c)quet, equivalent to jaque jack4 + -et -et
Related forms
jacketed, adjective
jacketless, adjective
jacketlike, adjective
underjacket, noun
unjacketed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for jacket
Contemporary Examples
Historical Examples
  • "I'll walk a bit with you," said his sister, donning her jacket and a cap.

    The Spenders Harry Leon Wilson
  • Viviette, coming in later in hat and jacket, found him busily writing.

    Viviette William J. Locke
  • Katy's fingers were shaking as she lifted the jacket and Linda slipped into it.

    Her Father's Daughter Gene Stratton-Porter
  • The sleeves of her jacket had been torn, and were mended with a material of another colour.

    The Dream Emile Zola
  • Then tapping the breast-pocket of his jacket: “And yet I am the force,” he went on.

    The Secret Agent Joseph Conrad
British Dictionary definitions for jacket


a short coat, esp one that is hip-length and has a front opening and sleeves
something that resembles this or is designed to be worn around the upper part of the body: a life jacket
any exterior covering or casing, such as the insulating cover of a boiler
the part of the cylinder block of an internal-combustion engine that encloses the coolant
  1. the skin of a baked potato
  2. (as modifier): jacket potatoes
a metal casing used in certain types of ammunition
(US) a cover to protect a gramophone record Brit name sleeve
(mainly US) a folder or envelope to hold documents
(transitive) to put a jacket on (someone or something)
Derived Forms
jacketed, adjective
jacket-like, adjective
Word Origin
C15: from Old French jaquet short jacket, from jacque peasant, from proper name Jacques James
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for jacket

mid-15c., "short garment for men," from Middle French jaquet "short coat with sleeves," diminutive of Old French jaque, a kind of tunic, probably from Jacque, the male proper name, also the generic name of a French peasant (see jacquerie), but possibly associated with jaque (de mailles) "short, tight-fitting coat," originally "coat of mail," from Spanish jaco, from Arabic shakk "breastplate." Iakke "a short, close-fitting stuffed or quilted tunic, often serving as a defensive garment" is attested in English from late 14c., and by c.1400 was being used for "woman's short tunic." Meaning "paper wrapper of a book" is first attested 1894.

Online Etymology Dictionary, © 2010 Douglas Harper
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jacket in Medicine

jacket jack·et (jāk'ĭt)

  1. A fixed bandage applied around the body to immobilize the spine.

  2. An artificial crown of a tooth composed of fired porcelain or acrylic resin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang definitions & phrases for jacket



A criminal record; rap sheet

Related Terms

dust someone's jacket, monkey jacket, yellow jacket

[1940s+ Police; fr the cardboard folder or jacket used to hold the papers]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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