/ Dictionary / Index D decelerometer: Meaning and Definition of Find definitions for: de•cel•er•om•e•ter Pronunciation: (dē-sel"u-rom'i-tur), [key] — n. a device that measures the rate of deceleration, as of a vehicle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decelerate deceleron 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