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Definition of citadel noun from the Oxford Advanced Learner's Dictionary

 

citadel

 noun
noun
BrE BrE//ˈsɪtədəl//
 
; NAmE NAmE//ˈsɪtədəl//
 
; BrE BrE//ˈsɪtədel//
 
; NAmE NAmE//ˈsɪtədel//
 
 
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(in the past) a castle on high ground in or near a city where people could go when the city was being attacked After the Mongol invasion of 1241, a citadel was built on the hills opposite the city. (figurative) citadels of private economic power Word Origin mid 16th cent.: from French citadelle, or from Italian cittadella, based on Latin civitas ‘city’, from civis ‘citizen’.
See the Oxford Advanced American Dictionary entry: citadel

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