The Collaborative International Dictionary
Fortification agate
Fortification \For`ti*fi*ca"tion\, n. [L. fortificatio : cf. F. fortification.]
The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
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That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
Fortification agate, Scotch pebble.
Syn: Fortress; citadel; bulwark. See Fortress.