- A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
- A piece of a man suit, beside trousers and, sometimes, waistcoat ; coat (italbrac, US)
- A removable or replaceable protective or insulating cover for an object (eg a book, hot water tank.)
- A police record.
- (transitive) To enclose or encase in a jacket or other covering.
Etymology: From jaquet, diminutive of jaque.
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Full Definition of jacket