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English definition of “citadel”

citadel

noun [C] uk   /ˈsɪt.ə.del/ us    /ˈsɪt̬-/

citadel noun [C] (BUILDING)

a strong castle in or near a city, where people can shelter from danger, especially during a war: The town has a 14th century citadel overlooking the river.

citadel noun [C] (ORGANIZATION)

literary a powerful organization in which finding a job is difficult for someone who does not know people who work there: At the age of 32, she managed to enter one of the citadels of high fashion.
(Definition of citadel from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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