A piece of clothing worn on the upper body over a shirt, typically having sleeves and a fastening down the front. She wore a warm jacket to protect herself from the cold wind.
A protective outer covering for something, such as a book or a record. The book's jacket was beautifully illustrated, attracting many readers.
A protective casing or cover, often used in engineering or construction. The pipes were insulated with a thick jacket to prevent heat loss.
The skin or outer covering of a vegetable, especially a potato, when left on during cooking. He prefers his baked potatoes served with their jackets on.
A metal casing surrounding the core of a bullet or projectile. Full-metal-jacket rounds have a harder outer jacket that reduces barrel fouling.