/ Dictionary / Index D deaccelerate: Meaning and Definition of Find definitions for: de•ac•cel•er•ate Pronunciation: (dē"ak-sel'u-rāt"), [key] — -at•ed, -at•ing. to decelerate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. DEA deaccession Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language