/ Dictionary / Index D deceleron: Meaning and Definition of Find definitions for: de•cel•er•on Pronunciation: (dē-sel'u-ron"), [key] — n. Aeron. an aileron that acts as a brake. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decelerometer decem* 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