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Bastion | Definition of Bastion by Merriam-Webster

Bastion is constructed of etymological building blocks that are very similar to those of "bastille" (a word now used as a general term for a prison, but probably best known as the name of the Parisian fortress-turned-prison stormed by an angry mob at the start of the French Revolution)..

Bastion - Wikipedia

A bastion or bulwark is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of two faces and two flanks, with fire from the flanks being able to protect the curtain wall and the adjacent bastions..

Bastion | Definition of Bastion at Dictionary.com

noun Fortification. a projecting portion of a rampart or fortification that forms an irregular pentagon attached at the base to the main work..

Bastion - definition of bastion by The Free Dictionary

1. a projecting portion of a rampart or fortification that forms an irregular pentagon attached at the base to the main work. 2. a fortified place. 3. anything seen as preserving some quality, condition, etc.: a bastion of democracy..