For·tress n.; pl. Fortresses A fortified place; a large and permanent fortification, sometimes including a town; a fort; a castle; a stronghold; a place of defense or security.
Syn: -- Fortress, Fortification, Castle, Citadel.
Usage: A fortress is constructed for military purposes only, and is permanently garrisoned; a fortification is built to defend harbors, cities, etc.; a castle is a fortress of early times which was ordinarily a palatial dwelling; a citadel is the stronghold of a fortress or city, etc.
For·tress, v. t. To furnish with a fortress or with fortresses; to guard; to fortify.
n : a fortified defensive structure [syn: fort]