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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.
1. (Fortifications) the surrounding embankment of a fort, often including any walls, parapets, walks, etc, that are built on the bank. 2. anything resembling a rampart in form or function, esp in being a defence or bulwark. 3. Canadian a steep rock wall in a river gorge.