/ Dictionary / Index D Department of Transportation: Meaning and Definition of Find definitions for: Depart'ment of Transporta'tion Pronunciation: [key] the department of the U.S. federal government that coordinates and institutes national transportation programs. Abbr.: DOT Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Department of the Treasury department store Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language