ac·​cel·​er·​a·​tion | \ ik-ˌse-lə-ˈrā-shən How to pronounce acceleration (audio) , (ˌ)ak-\

Definition of acceleration

1a : the act or process of moving faster or happening more quickly : the act or process of accelerating rapid acceleration the acceleration of economic growth
b : ability to accelerate a car with good acceleration
2 physics : the rate of change of velocity with respect to time broadly : change of velocity

Examples of acceleration in a Sentence

The car delivers quick acceleration. There has been some acceleration in economic growth. There has been an acceleration in economic growth.
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Recent Examples on the Web

The wearable is currently being crowdfunded through Sony's First Flight acceleration program in Japan, and prices will start around $117. Dalvin Brown, USA TODAY, "Here's a cool new product: Sony's wearable air conditioner may make you 23 degrees cooler," 29 July 2019 But the basic performance is calibrated for fuel economy and resists immediate acceleration. Mark Maynard, San Diego Union-Tribune, "2019 Audi A7 Sportback: a continental grand tourer," 26 July 2019 The Reon Pocket comes out of Sony’s startup acceleration program, and Sony is currently crowdfunding the device (link in Japanese). Marc Bain, Quartzy, "Sony has made an in-shirt air conditioner," 25 July 2019 Having more weight over the back wheels will also help with acceleration. Peter Valdes-dapena, CNN, "GM unveils a radically new Corvette," 18 July 2019 Murray has an awareness rating of 65, a speed rating of 91, an acceleration rating of 92, an agility rating of 90 and a strength rating of 51. Jeremy Cluff, azcentral, "Kyler Murray or Josh Rosen? Madden NFL 20 player ratings answer the quarterback debate," 15 July 2019 The manufacturer estimates a 0-to-60-mph acceleration time of 8.9 seconds with a top speed of 118 mph. Frank A. Aukofer, Houston Chronicle, "2019 LEXUS UX 250h: Luxury hybrid comes with all-wheel drive," 14 July 2019 After Alaphilippe led the Deceuninck-Quick Step train to the front, Max Richeze and Michael Morkov set a very fast tempo to launch Viviani's final acceleration., "Tour de France: Viviani storms bunch sprint to win Stage 4," 9 July 2019 Most people prefer quiet and higher gas mileage to a little zippier acceleration., "Car Talk: Mystery overheating may be due to cooling fan," 21 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'acceleration.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of acceleration

15th century, in the meaning defined at sense 1a

History and Etymology for acceleration

borrowed from Anglo-French & Latin; Anglo-French acceleratiun, borrowed from Latin accelerātiōn-, accelerātiō, from accelerāre "to accelerate" + -tiōn-, -tiō, suffix of action nouns

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Statistics for acceleration

Last Updated

7 Aug 2019

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Time Traveler for acceleration

The first known use of acceleration was in the 15th century

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More Definitions for acceleration


ac·​cel·​er·​a·​tion | \ ak-ˌse-lə-ˈrā-shən How to pronounce acceleration (audio) \

Kids Definition of acceleration

: the act or process of speeding up


ac·​cel·​er·​a·​tion | \ ik-ˌsel-ə-ˈrā-shən, (ˌ)ak- How to pronounce acceleration (audio) \

Medical Definition of acceleration

1 : the act or process of accelerating : the state of being accelerated
2 : change of velocity also : the rate of this change
3 : advancement in mental growth or achievement beyond the average for one's age

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Comments on acceleration

What made you want to look up acceleration? Please tell us where you read or heard it (including the quote, if possible).


a period when something is suspended

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