/ Dictionary / Index C citadel: Meaning and Definition of Find definitions for: cit•a•del Pronunciation: (sit'u-dl, -u-del"), [key] — n. a fortress that commands a city and is used in the control of the inhabitants and in defense during attack or siege. any strongly fortified place; stronghold. (formerly) a heavily armored structure on a warship, for protecting the engines, magazines, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: citadel (Thesaurus) cit citation Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language