What is the meaning of Jacket?

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

A piece of a person's suit, beside trousers and, sometimes, waistcoat; coat

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

A police record.

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

The tough outer skin of a baked potato.

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

A vest ; a waistcoat .

To confine (someone) to a straitjacket.

To enclose or encase in a jacket or other covering.

Source: wiktionary.org