Definition of "jacket" in English

noun

1. A piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.

2. A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat (US)

3. A protective or insulating cover for an object (e.g. a book, hot water tank, bullet.)

4. (slang) A police record.

   • "I need to look up somebody's jacket."

5. (military) In ordnance, a strengthening band surrounding and reinforcing the tube in which the charge is fired.

6. The tough outer skin of a baked potato.

   • Cook the potatoes in their jackets.

7. (Jamaica) A bastard child, in particular one whose father is unaware that he is not the child’s biological father.

8. (Appalachia) A vest (US); a waistcoat (UK).

verb

1. To confine (someone) to a straitjacket.

2. (transitive) To enclose or encase in a jacket or other covering.