fortifications

plural of fortification

(countable, uncountable) The act of fortifying; the art or science of fortifying places to strengthen defence against an enemy.
(countable, uncountable) That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
(countable, uncountable) An increase in effectiveness, as by adding ingredients.
(countable, uncountable) A jagged pattern sometimes seen during an attack of migraine.