What is the meaning of Fortification?

The act of fortifying; the art or science of fortifying places to strengthen defence against an enemy.

That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.

An increase in effectiveness, as by adding ingredients.

A jagged pattern sometimes seen during an attack of migraine.

fortification (all meanings)

Source: wiktionary.org