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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.
Meaning: A fortified defensive structure. Classified under: Nouns denoting man-made objects. Synonyms: fortress; fort. Hypernyms (fortress is a kind of...): defence; defense; defensive structure (a structure used to defend against attack). Meronyms (parts of fortress): battlement; crenelation; crenellation (a rampart built around the top of a castle with regular gaps for firing arrows or guns).