fortifications
n. plural-only B2 Upper Intermediate US //ˌfɔɹtəfəˈkeɪʃənz// UK //fˌɔːtɪfɪkˈeɪʃənz// for·ti·fi·ca·tions
n. strong walls, towers, or buildings made to protect a place from an attack. You usually see these around old cities or military bases.
n. defensive structures, such as walls, embankments, or towers, erected to strengthen a location against military attack.
The ancient city is still surrounded by stone fortifications.
Engineers spent months building heavy fortifications along the border to prevent a ground invasion.
The coastal fortifications, though now weathered by centuries of salt air, remain a testament to the strategic importance of the harbor during the Napoleonic Wars.
Usage
Usually appears in the plural form when referring to a set of defensive works; takes a plural verb.