Etymology
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citadel (n.)

"fortress commanding a city," 1580s, from French citadelle (15c.), from Italian cittadella, diminutive of Old Italian cittade "city" (Modern Italian citta), from Latin civitatem (nominative civitas; also source of Portuguese citadella, Spanish ciuadela; see city).

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Definitions of citadel

citadel (n.)
a stronghold into which people could go for shelter during a battle;
Synonyms: bastion
From wordnet.princeton.edu