citadel - definition and synonyms

noun [countable] 

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/ˈsɪtəd(ə)l/

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/ˈsɪtədel/
singularcitadel
pluralcitadels
  1. 2
    literary a place that seems to represent all the important aspects of an idea, method, or practice
    citadel of:

    a citadel of learning