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[dee-sel-uh-reyt] /diˈsɛl əˌreɪt/
verb (used with object), decelerated, decelerating.
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.
verb (used without object), decelerated, decelerating.
to slow down:
The plane decelerated just before landing.
Origin of decelerate
First recorded in 1895-1900; de- + (ac)celerate
Related forms
deceleration, noun
decelerator, noun
nondeceleration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for deceleration
Historical Examples
  • deceleration sat on their chests and squeezed their bones to rubber.

    The K-Factor Harry Harrison (AKA Henry Maxwell Dempsey)
  • It would still take four hours to get down, in a spiral of deceleration.

    Space Viking Henry Beam Piper
  • Casker nodded and punched a deceleration spiral into the ship's tape.

    One Man's Poison Robert Sheckley
  • The ship quivered for just a second as it shifted over into deceleration.

    An Empty Bottle Mari Wolf
  • Ekstrohm fingered loose the cinches of his deceleration couch.

  • In a few seconds the pressure of deceleration pushed at them.

    Rip Foster in Ride the Gray Planet

    Harold Leland Goodwin
  • Allowing for deceleration, three successive predictions of its landing point agreed.

    Operation Terror William Fitzgerald Jenkins
  • You're the only member we have, who's inside the grounds here, who can stand the acceleration and deceleration.

    By Earthlight Bryce Walton
  • deceleration jumped on them, kicked the air from their lungs in uncontrollable gasps, sank them deep into the yielding couches.

    The Ethical Engineer Henry Maxwell Dempsey
  • He came out of it sluggishly, to find the relief from the dreadful pressure almost as stupefying as the deceleration itself.

    Far from Home J.A. Taylor
British Dictionary definitions for deceleration


to slow down or cause to slow down
Derived Forms
deceleration, noun
decelerator, noun
Word Origin
C19: from de- + accelerate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for deceleration

1894, originally in railroading, coined from de- "do the opposite of" (see de-) + (ac)celeration.

Verily "deceleration" is a word which could only be coined by the Great Western. ["Engineering," Feb. 2, 1894]



1899, back-formation from deceleration. Related: Decelerated; decelerating.

Online Etymology Dictionary, © 2010 Douglas Harper
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