A large bastion or fortified structure, or a diminutive or variant form of bastion used in military architecture.
From bastion with the Italian diminutive suffix -ione/-illion. This blends the military architectural term bastion with Romance language diminutive conventions, creating a term for a smaller or secondary fortified position.
Medieval fortification design evolved from simple towers to complex systems of bastions and bastillions, allowing defenders to cover multiple angles of attack—the geometry of defense literally shaped European castle architecture.
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