01 n. The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
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1.
The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
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2.
That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
Phrases & compounds
Fortification agate —
Scotch pebble.