/ Dictionary / Index D DUI: Meaning and Definition of Find definitions for: DUI Pronunciation: [key] driving under the influence (of alcohol or drugs): often used as an official police abbreviation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dui (Thesaurus) Duhamel duiker 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