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English definition of “acceleration”

acceleration

noun uk   /əkˌsel.əˈreɪ.ʃən/ us  
[U] the increase in something's speed, or its ability to go faster: An older car will have poor acceleration. High winds significantly hampered the plane's acceleration. [S or U] the increase in the speed at which something happens: The acceleration in the decline of manufacturing industry began several years ago.
(Definition of acceleration from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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