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