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fortification /ˌfoɚtəfəˈkeɪʃən/  

  • noun
    plural -tions
    [noncount] :the act of building military defenses to protect a place against attack :the act of fortifying something
    They began the fortification and reconstruction of the city.
    [count] :a structure (such as a wall or tower) that is built to protect a place - usually plural