the act of accelerating; increase of speed or velocity.
a change in velocity.
Mechanics. the time rate of change of velocity with respect to magnitude or direction; the derivative of velocity with respect to time.

1525–35; < Latin accelerātiōn- (stem of accelerātiō). See accelerate, -ion

nonacceleration, noun
overacceleration, noun
reacceleration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acceleration (ækˌsɛləˈreɪʃən)
1.  the act of accelerating or the state of being accelerated
2.  a the rate of increase of speed or the rate of change of velocity
3.  a the power to accelerate

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from L. accelerationem (nom. acceleratio) "a hastening," from accelerare (see accelerate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
acceleration  [%PREMIUM_LINK%]     (āk-sěl'ə-rā'shən)  Pronunciation Key 
The rate of change of the velocity of a moving body. An increase in the magnitude of the velocity of a moving body (an increase in speed) is called a positive acceleration; a decrease in speed is called a negative acceleration. Acceleration, like velocity, is a vector quantity, so any change in the direction of a moving body is also an acceleration. A moving body that follows a curved path, even when its speed remains constant, is undergoing acceleration. See more at gravity, relativity.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

acceleration definition

A change in the velocity of an object.

Note: The most familiar kind of acceleration is a change in the speed of an object. An object that stays at the same speed but changes direction, however, is also being accelerated. (See force.)
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
With the added weight of people and supplies, it would simply take too long for
  the craft to reach acceleration speed.
Observe the speed limit and avoid rapid acceleration or braking.
Inertia sensors are faster, but less accurate, providing only acceleration and
  rotation speed.
For heavy acceleration and high speed, these vehicles rely on power from both
  an internal combustion engine and an electric motor.
Image for acceleration
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