Dictionaryac•cel•er•a•tionPronunciation: (ak-sel"u-rā'shun), [key] —n. 1. the act of accelerating; increase of speed or velocity. 2. a change in velocity. 3. Mech.the time rate of change of velocity with respect to magnitude or direction; the derivative of velocity with respect to time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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