Definition of jacket in English:

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Pronunciation: /ˈjakət/


1An outer garment extending either to the waist or the hips, typically having sleeves and a fastening down the front.
Example sentences
  • Often featuring a snap front and drawstring waist, this jacket maybe lined or unlined.
  • The popular lengths for jackets this fall are waist length, three-quarter length and trench coat length.
  • I reached into the front pocket of my jacket and took out a small business card.
1.1An outer covering, especially one placed around a tank or pipe to insulate it.
Example sentences
  • If you have a conventional water heater, give it a wrap as well with an insulated jacket that will help prevent energy loss.
  • Bosch designed a thin inner liner of soft steel that sealed the gases in, its pressure load supported by a stout perforated steel jacket.
  • Similarly, a steel and concrete jacket was secured to the swing span central pier in 1936.
1.2A metal casing for a bullet.
Example sentences
  • I test fired the Robar 228 with a wide variety of full metal jacket and hollow-point loads to test for reliability.
  • The idea of an EFMJ is a bullet whose jacket is weakened from the inside so that it splits open on contact with a target.
  • In 1948, the Nosler Partition Bullet Co. formed to make bullet jackets turned out one at a time on a lathe.
1.3The skin of a potato: potatoes cooked in their jackets
More example sentences
  • All we ate every day was a piece of black bread and three potatoes cooked in their jackets.
  • What next, said the Herald, oranges with no peel, potatoes without jackets?
  • New season potatoes, baked in their jackets and dressed ever so slightly with olive oil are the best possible accompaniment to properly cooked burgers and a green salad.
1.4The dust jacket of a book.
Example sentences
  • You may not have heard of House Industries, but you will undoubtedly have seen their work, be it on book jackets, CD covers or in the typography of advertising.
  • A selection of books are on display with a summary of the story covering the book jacket.
  • The atmosphere is literary, with the walls covered in huge posters of book jackets of American literary masterpieces.
1.5A record sleeve.
Example sentences
  • While I gazed at walls decorated with faded record jackets, the owner enthralled me with his in-depth knowledge of this musical genre.
  • Record jackets of all types lined the walls and memorabilia from the rock and roll era filled the many shelves all around the establishment.
  • Nelly nodded looking over my shoulder at the titles on the jackets of the records.
1.6A steel frame fixed to the seabed, forming the support structure of an oil production platform.

verb (jackets, jacketing, jacketed)

[with object]
Cover with a jacket.
Example sentences
  • While most bullets have been jacketed with copper-zinc alloy, a variety of other hard metals, including tungsten, have been used.
  • For cladding-pumped laser experiments, some preforms have been jacketed with a second quartz glass tube in order to increase the cladding-core relation.
  • Old stoves have been jacketed and furnaces put in. Artificial lighting systems have been installed.


Late Middle English: from Old French jaquet, diminutive of jaque (see jack2).

  • Jacket is from Old French jaquet, a diminutive of jaque, a word for a kind of tunic. The origin of the French word is uncertain, but it may have been identical with the common given name Jacques (a form of James— compare jack) and be associated with a garment worn by the common people. An alternative theory takes jaques de mailles, a tunic of chain mail, as the original form and links it via Spanish jaco to Arabic sakk ‘breastplate’.

Words that rhyme with jacket

Blackett, bracket, packet, placket, racket

For editors and proofreaders

Syllabification: jack·et

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