Dictionary (n.) A fortress in or near a fortified city, commanding the city and fortifications\, and intended as a final point of defense.Thesaurus acropolis bastion beachhead blockhouse bridgehead bunker castle donjon fasthold fastness fort fortress 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 |