/ Dictionary / Index D donjon: Meaning and Definition of Find definitions for: don•jon Pronunciation: (dun'jun, don'-), [key] — n. the inner tower, keep, or stronghold of a castle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: donjon (Thesaurus) Donizetti Don Juan Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language