1. (n.) A fortified place; a large and permanent fortification, sometimes including a town; a fort; a castle; a stronghold; a place of defense or security.

2. (v. t.) To furnish with a fortress or with fortresses; to guard; to fortify.

acropolis bastion beachhead blockhouse bridgehead bunker castle citadel donjon fasthold fastness fort garrison garrison house hold keep martello martello tower mote motte peel peel tower pillbox post rath redoubt safehold strong point stronghold tower tower of strength ward