fortification
noun
[ ˌfɔːtɪfɪˈkeɪʃ(ə)n ]
• a defensive wall or other reinforcement built to strengthen a place against attack.
• "the building and maintenance of fortifications"
Similar:
rampart,
defensive wall,
defences,
bulwark,
palisade,
stockade,
redoubt,
earthwork,
outwork,
bastion,
parapet,
battlement,
blockhouse,
barricade,
buttress,
stronghold,
fieldwork,
ravelin,
fortalice,
Origin:
late Middle English: via French from late Latin fortificatio(n- ), from fortificare (see fortify).