de·cel·er·ate

[dee-sel-uh-reyt] verb, de·cel·er·at·ed, de·cel·er·at·ing.
verb (used with object)
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)
3.
to slow down: The plane decelerated just before landing.

Origin:
1895–1900; de- + (ac)celerate

de·cel·er·a·tion, noun
de·cel·er·a·tor, noun
non·de·cel·er·a·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To deceleration
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World English Dictionary
decelerate (diːˈsɛləˌreɪt) [Click for IPA pronunciation guide]
 
vb
to slow down or cause to slow down
 
[C19: from de- + accelerate]
 
deceler'ation
 
n
 
de'celerator
 
n

00:10
Deceleration is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
decelerate (diːˈsɛləˌreɪt) [Click for IPA pronunciation guide]
 
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
Cite This Source
Example sentences
Deceleration levels were initiated by the driver through the standard braking
  system of the vehicle.
As these examples indicate, a deceleration need not precipitate disaster.
The compound braking effect on the deceleration rate was also evaluated.
The deceleration lane runs parallel to the through lanes and is separated from
  them by a dotted and then broken white line.
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