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Definition of acceleration noun from the Oxford Advanced American Dictionary

     

    acceleration

     noun
    noun
    NAmE//əkˌsɛləˈreɪʃn//
     
     
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  1. 1[uncountable, singular] acceleration (in something) an increase in how fast something happens an acceleration in the rate of economic growth
  2. 2[uncountable] the rate at which a vehicle increases speed a car with good acceleration acceleration from 0–60 mph in 11.2 seconds
  3. 3 [uncountable] (physics) the rate at which the velocity (= speed in a particular direction) of an object changes acceleration caused by gravity
See the Oxford Advanced Learner's Dictionary entry: acceleration