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jacket definition


This page has 10 definitions of jacket in English. Jacket is a noun and verb. Examples of how to use jacket in a sentence are shown. Also define these 0 related words and terms: .



From Middle French jacquet, diminutive of Old French jaque.



jacket (plural jackets)

  1. A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
  2. A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)
  3. A protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)
  4. (slang) A police record.
  5. (military) In ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.
  6. The tough outer skin of a baked potato.
    Cook the potatoes in their jackets.
  7. (Jamaica) A bastard child, in particular one whose father is unaware that they are not the child’s biological father.
  8. (Appalachia) A vest(US); a waistcoat (UK)


  • (piece of a person's suit): coat (US)
  • (removable protective cover): sleeve

Derived terms



The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Dictionary:Entry layout § Translations.


jacket (third-person singular simple present jackets, present participle jacketing, simple past and past participle jacketed)

  1. To confine (someone) to a straitjacket. [from 18th c.]
    • 1792, Thomas Holcroft, Anna St. Ives, volume VII, Fragment:
      ‘None of your gab, I tell you! If you speak another word, I'll have you jacketed [] !’
  2. (transitive) To enclose or encase in a jacket or other covering. [from 19th c.]
    • 1897, Alexander James Wallis-Tayler, Motor Cars Or Power-carriages for Common Roads[1]:
      ...to...prevent...the loss of heat...there is also a layer of silicate cotton or slag wool. This latter material is also employed to jacket the chimney for a certain portion of its length.

Derived terms