/ Dictionary / Index D decelerate: Meaning and Definition of Find definitions for: de•cel•er•ate Pronunciation: (dē-sel'u-rāt"), [key] — v., -at•ed, -at•ing. —v.t. to decrease the velocity of: He decelerates the bobsled when he nears a curve. to slow the rate of increase of: efforts to decelerate inflation. —v.i. to slow down: The plane decelerated just before landing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decelerate (Thesaurus) deceive decelerometer 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