citadel

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citadel /ˈsɪtədl̟/ noun
plural citadels
citadel
/ˈsɪtədl̟/
noun
plural citadels
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 often used figuratively
◊ In the U.S., The Citadel is the name of a well-known military college.