Definition of jacket in English:


Line breaks: jacket
Pronunciation: /ˈdʒakɪt


1An outer garment extending either to the waist or the hips, typically having sleeves and a fastening down the front: [as modifier]: he put his hand in his jacket pocket
More 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.
2An outer covering, especially one placed round a tank or pipe to insulate it.
More 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.
2.1The dust jacket of a book.
More 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.
2.2A record sleeve.
More 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.
3British The 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.
3.1 informal A jacket potato.
More example sentences
  • The menu boasts everything from rump steaks to bangers and mash - and there are jackets and baguettes available too.
  • I had a jacket with cheese and beans on Thursday and a cheese salad for lunch as well.
  • We sat in the cafe and had a mundane lunch (a jacket with tuna - the tuna was more mayonnaise than anything and tasted like cement).
4US A folder or envelope containing an official document or file.
5A steel frame fixed to the seabed, forming the support structure of an oil production platform.

verb (jackets, jacketing, jacketed)

[with object] Back to top  
Cover with a jacket.
More 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).

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