Fortification

n. strengthening, fortifying; corroboration; something which fortifies or defends

Fortifications are military constructions and buildings designed for defense in warfare. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs. The term is derived from the Latin fortis ("strong") and facere ("to make").
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Noun
1. defensive structure consisting of walls or mounds built around a stronghold to strengthen it
(synonym) munition
(hypernym) defensive structure, defense, defence
(hyponym) bastion
(part-meronym) rampart, bulwark, wall
(derivation) fortify, fort
2. the art or science of strengthening defenses
(hypernym) art, artistry, prowess
(derivation) arm, build up, fortify, gird
3. the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
(hypernym) enrichment
(derivation) fortify

n. fortification, enforcement, strengthening

(n.)
The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
  

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