decelerate

[dee-sel-uh-reyt]
verb (used with object), decelerated, decelerating.
1.
to decrease the velocity of: He decelerates the bobsled when he nears a curve.
2.
to slow the rate of increase of: efforts to decelerate inflation.
verb (used without object), decelerated, decelerating.
3.
to slow down: The plane decelerated just before landing.

Origin:
1895–1900; de- + (ac)celerate

deceleration, noun
decelerator, noun
nondeceleration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
decelerate (diːˈsɛləˌreɪt)
 
vb
to slow down or cause to slow down
 
[C19: from de- + accelerate]
 
deceler'ation
 
n
 
de'celerator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

deceleration
1897, coined from de- "do the opposite of" + (ac)celeration.

decelerate
1899, from de- + (ac)celerate.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It occurs when there is a sudden acceleration or deceleration of the head, a
  process depicted here in this animation.
Those precise observations only confirm the expected deceleration of the
  universe.
Not taking into account acceleration and deceleration times plus time to
  explore the target system.
Only since then has there been the surprising deceleration in wage growth.
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