GNU Collaborative International Dictionary of English

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1.       
   Citadel , n. [F. citadelle, It. citadella, di. of citt city, fr. L. civitas. See City.] A fortress in or near a fortified city, commanding the city and fortifications, and intended as a final point of defense.
   1913 Webster
   Syn. -- Stronghold. See Fortress.
   1913 Webster