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.