Definitions
1.nounA piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.
2.nounA piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)
3.nounA protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)
4.nounA police record.
5.nounIn ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.
6.nounThe tough outer skin of a baked potato."Cook the potatoes in their jackets."
7.verbTo enclose or encase in a jacket or other covering.