Definitions
1.nounThe act of fortifying; the art or science of fortifying places to strengthen defence against an enemy.
2.nounThat which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
3.nounAn increase in effectiveness, as by adding ingredients.
4.nounA jagged pattern sometimes seen during an attack of migraine.