American English

Definition of jacket noun from the Oxford Advanced American Dictionary



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  1. 1a piece of clothing worn on the top half of the body over a shirt, etc. that has sleeves and fastens down the front; a short, light coat a denim/wool jacket I have to wear a jacket and tie to work. see also bomber jacket, dinner jacket, flak jacket, life jacket, smoking jacket, sports jacket, straitjacket
  2. 2(also dust jacket) a loose paper cover for a book, usually with a design or picture on it
  3. 3an outer cover around a hot water pipe, etc., for example to reduce loss of heat
  4. 4(also sleeve) a stiff paper envelope for a record a colorful jacket design
See the Oxford Advanced Learner's Dictionary entry: jacket