Meaning of ACCELERATION in English

ACCELERATION

/ əkˌseləˈreɪʃn; NAmE / noun

1.

[ U , sing. ] acceleration (in sth) an increase in how fast sth happens :

an acceleration in the rate of economic growth

2.

[ U ] the rate at which a vehicle increases speed :

a car with good acceleration

3.

[ U ] ( physics ) the rate at which the velocity (= speed in a particular direction) of an object changes

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WORD ORIGIN

late 15th cent.: from Latin acceleratio(n-) , from accelerare hasten, from ad- towards + celer swift.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.