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acceleration

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ac⋅cel⋅er⋅a⋅tion

  [ak-sel-uh-rey-shuhn]
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–noun
1. the act of accelerating; increase of speed or velocity.
2. a change in velocity.
3. Mechanics. the time rate of change of velocity with respect to magnitude or direction; the derivative of velocity with respect to time.
Origin:
1525–35; < L accelerātiōn- (s. of accelerātiō). See accelerate, -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ac·cel·er·a·tion   (āk-sěl'ə-rā'shən)   
n.  

    1. The act of accelerating.

    2. The process of being accelerated.

  2. Abbr. a Physics The rate of change of velocity with respect to time.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

acceleration

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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Medical Dictionary

Main Entry: ac·cel·er·a·tion
Pronunciation: ik-"sel-&-'rA-sh&n, (")ak-
Function: noun
1 : the act or process ofaccelerating : the state of being accelerated
2 : change of velocity; also : the rate of this change
3 : advancement in mental growthor achievement beyond the average for one's age
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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