/ Dictionary / Index D dn.: Meaning and Definition of Find definitions for: dn. Pronunciation: [key] down. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. DMZ DNA Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language