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Definition of fortress : 1. 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. To furnish with a fortress or with fortresses; to guard; to fortify.

Synonyms:

justification, chateau, bulwark, vindication, redoubt, casbah, hold, castle, campanile, apology, belfry, fort, battlements, bastion, fortification, chatelaine, bell tower, citadel, bailey, garrison, fastness, castellated, rampart

cover, armor, aversion, answer, backfire, moat, counterattack, retort, buffer, countermeasure, response, guard, reply, protection, return, barricade, support, resistance, stronghold, safeguard, harbor, shield, rebuttal, shelter, barrier, security, defense, argument, wall, screen

Usage examples:

• I had taken the usual precaution to close the gates of my fortress, and this time I slept my sleep out, undisturbed by the rats. - "The Boy Tar", Mayne Reid.
• But when morning came he could not stay away from the fortress of Antonia, where he knew that Jesus would soon be brought before Pilate. - "Men Called Him Master", Elwyn Allen Smith.
• Instead, she filled the upper gallery of that old fortress with a collection of pictures that would make any gallery in Europe famous. - "The Genius", Margaret Horton Potter.