Fortification
/fˌɔrtəfəˈkeɪʃən/
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Definition
(noun) The act of fortifying; the art or science of fortifying places to strengthen defence against an enemy.
Sentence Examples
The rocky massif located around the Iset River also served as a natural fortification.
CEFR Practice Quiz
The massive stone walls served as a vital ____ for the city during times of intense warfare.