# acceleration

[ ak-sel-uh-rey-shuhn ]
/ ækˌsɛl əˈreɪ ʃən /
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noun
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.
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## Origin ofacceleration

First recorded in 1525–35, acceleration is from the Latin word accelerātiōn- (stem of accelerātiō). See accelerate, -ion

## OTHER WORDS FROM acceleration

non·ac·cel·er·a·tion, nouno·ver·ac·cel·er·a·tion, nounre·ac·cel·er·a·tion, noun

## Words nearby acceleration

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

## British Dictionary definitions for acceleration

acceleration
/ (ækˌsɛləˈreɪʃən) /

noun
the act of accelerating or the state of being accelerated
the rate of increase of speed or the rate of change of velocitySymbol: a
the power to accelerateSymbol: a
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Scientific definitions for acceleration

acceleration
[ ăk-sĕl′ə-rāshən ]

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.