- a fortress that commands a city and is used in the control of the inhabitants and in defense during attack or siege.
- any strongly fortified place; stronghold.
- (formerly) a heavily armored structure on a warship, for protecting the engines, magazines, etc.
- a stronghold within or close to a city
- any strongly fortified building or place of safety; refuge
- a specially strengthened part of the hull of a warship
- the headquarters of the Salvation Army
