Definition of citadel noun from the Oxford Advanced American Dictionary

     

    citadel

     noun
    noun
    NAmE//ˈsɪt̮ədəl//
     
    , NAmE//ˈsɪt̮əˌdɛl//
     
     
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  1. 1(in the past) a castle on high ground in or near a city, where people could go when the city was being attacked
  2. 2(figurative) citadels of private economic power
See the Oxford Advanced Learner's Dictionary entry: citadel

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