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fortification. 1  the act of fortifying or strengthening. 2  something that fortifies or protects. 3  the art or science of constructing defensive military works. 4  Often, fortifications. military works constructed for the purpose of strengthening a position; a fort: Supposedly impregnable, the fortifications were quickly overrun.
A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. This derives from sedere, Latin for to sit.[1] Siege warfare is a form of constant, low-intensity conflict characterized by one party holding a strong, static defensive position.