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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.
Freebase(0.00 / 0 votes)Rate this definition: Fort. Fort is a business district in Mumbai, India. The area was the heart of the city during the 18th century. The area gets its name from the defensive fort, Fort George, built by the British East India Company around Bombay Castle.