Longman Dictionary of Contemporary English homepage

fortification

 noun
     
for‧ti‧fi‧ca‧tion
1 [uncountable] the process of making something stronger or more effective
2

fortifications

[plural] towers, walls etc built around a place in order to protect it or defend it:
a site of ancient fortifications dating from about 500 B.C.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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