fortifications is a form of:

Fortification



noun
1.
(a making strong, fortifying prepa ration against attack, a protective wall, mound of earth, or other stru cture, sometimes temporary, as on a battlefield, a fort or system of forts) build a fortification សំណង់ការពារសឹកសត្រូវ, fortification of the palace ការរៀបចម្ការពារសឹកសត្រូវ (ការដ្ឋាន)
ENGLISH MEANING
noun
1.
The act of fortifying; the art or science of fortifying places in order to defend them against an enemy.
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.