World English Dictionary
jacket (ˈdʒækɪt)
1.  a short coat, esp one that is hip-length and has a front opening and sleeves
2.  something that resembles this or is designed to be worn around the upper part of the body: a life jacket
3.  any exterior covering or casing, such as the insulating cover of a boiler
4.  the part of the cylinder block of an internal-combustion engine that encloses the coolant
5.  See dust jacket
6.  a.  the skin of a baked potato
 b.  (as modifier): jacket potatoes
7.  a metal casing used in certain types of ammunition
8.  (US) Brit name: sleeve a cover to protect a gramophone record
9.  chiefly (US) a folder or envelope to hold documents
10.  (tr) to put a jacket on (someone or something)
[C15: from Old French jaquet short jacket, from jacque peasant, from proper name Jacques James]

Collins English Dictionary - Complete & Unabridged 10th Edition
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