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citadel

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citadel/ˈsɪtədl̟/noun
pluralcitadels
citadel
/ˈsɪtədl̟/
noun
pluralcitadels
Learner's definition of CITADEL  
[count]
: a castle or fort that in past times was used to protect the people of a city if the city was attacked
◊ In the U.S., The Citadel is the name of a well-known military college.
— often used figuratively
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