Dictionary![]() ![]() jack•etPronunciation: ( jak'it), [key] —n. 1. a short coat, in any of various forms, usually opening down the front. 2. something designed to be placed around the upper part of the body for a specific purpose other than use as clothing: a life jacket. 3. a protective outer covering. 4. the skin of a potato, esp. when it has been cooked. 5. See book jacket. 6. the cover of a paperbound book, usually bearing an illustration. 7. a paper or cardboard envelope for protecting a phonograph record. 8. a metal casing, as the steel covering of a cannon, the steel cover around the core of a bullet, or the water jacket on certain types of machine guns. 9. a folded paper or open envelope containing an official document. —v.t. to put a jacket on (someone or something). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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