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acceleration /ɪkˌsɛləˈreɪʃən/  

  • noun
    the act or process of moving faster or happening more quickly :the act or process of accelerating [noncount]
    The car delivers quick/rapid acceleration.
    The car has good acceleration. [=the car is able to accelerate quickly]
    There has been some acceleration in economic growth. [singular]
    There has been an acceleration in economic growth.
    [noncount] physics :the rate at which the speed of a moving object changes over time