1.  fortification(n = noun.artifact) munition - defensive structure consisting of walls or mounds built around a stronghold to strengthen it;
is a kind of defence, defense, defensive structure
has parts: bulwark, rampart, wall
has particulars: bastion, bunker, dugout, castle, defilade, entrenchment, intrenchment, escarp, escarpment, protective embankment, scarp, fieldwork, lunette, palisade, breastwork, parapet, redoubt, stockade, maginot line, siegfried line
Derived form verb fortify₂

2.  fortification(n = noun.cognition) - the art or science of strengthening defenses;
is a kind of art, artistry, prowess
Derived forms verb fortify₁, verb fortify₃

3.  fortification(n = noun.act) - the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food);
is a kind of enrichment
Derived forms verb fortify₁, verb fortify₅, verb fortify₄

1.  The act of fortifying; the art or science of fortifying places in order to defend them against an enemy. [1913 Webster]

2.  That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle. [1913 Webster]

fortification, n.
1 the act or an instance of fortifying; the process of being fortified.
2 Mil. a the art or science of fortifying. b (usu. in pl.) defensive works fortifying a position.

Etymology:
ME f. F f. LL fortificatio -onis act of strengthening (as FORTIFY)

N  defense, protection, guard, ward, shielding, propugnation, preservation, guardianship, area defense, site defense, self-defense, self-preservation, resistance, safeguard, balistraria, bunker, screen, camouflage, fortification, munition, muniment, trench, foxhole, bulwark, fosse, moat, ditch, entrenchment, intrenchment, kila, dike, dyke, parapet, sunk fence, embankment, mound, mole, bank, sandbag, revetment, earth work, field- work, fence, wall dead wall, contravallation, paling, palisade, haha, stockade, stoccado, laager, sangar, barrier, barricade, boom, portcullis, chevaux de frise, abatis, abattis, abbatis, vallum, circumvallation, battlement, rampart, scarp, escarp, counter-scarp, glacis, casemate, vallation, vanfos, buttress, abutment, shore, breastwork, banquette, curtain, mantlet, bastion, redan, ravelin, vauntmure, advance work, horn work, outwork, barbacan, barbican, redoubt, fort-elage, fort-alice, lines, loophole, machicolation, sally port, hold, stronghold, fastness, asylum, keep, donjon, dungeon, fortress, citadel, capitol, castle, tower of strength, tower of strength, fort, barracoon, pah, sconce, martello tower, peelhouse, blockhouse, rath, wooden walls, bulletproof vest, armored vest, buffer, corner stone, fender, apron, mask, gauntlet, thimble, carapace, armor, shield, buckler, aegis, breastplate, backplate, cowcatcher, face guard, scutum, cuirass, habergeon, mail, coat of mail, brigandine, hauberk, lorication, helmet, helm, bassinet, salade, heaume, morion, murrion, armet, cabaset, vizor, casquetel, siege cap, headpiece, casque, pickelhaube, vambrace, shako, bearskin, panoply, truncheon, garrison, picket, piquet, defender, protector, guardian, bodyguard, champion, knight-errant, Paladin, propugner, bulletproof window, hardened site, defending, defensive, mural, armed, armed at all points, armed cap-a-pie, armed to the teeth, panoplied, iron-plated, ironclad, loopholed, castellated, machicolated, casemated, defended, proof against, armored, ballproof, bulletproof, hardened, defensively, on the defense, on the defensive, in defense, at bay, pro aris et focis, Int, no surrender!, defense not defiance, Dieu defend le droit, fidei defensor, defender of the faith.