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Definition of deceleration noun from the Oxford Advanced Learner's Dictionary

     

    deceleration

     noun
    noun
    BrE BrE//ˌdiːseləˈreɪʃn//
     
    ; NAmE NAmE//ˌdiːseləˈreɪʃn//
     
    (formal)
     
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  1. 1[uncountable, countable] a reduction in the speed at which a vehicle is travelling The motor generates energy during braking and deceleration. Avoid sudden decelerations.
  2. 2[uncountable] the act or process of slowing down; the act or process of making something slower a deceleration in economic growth
  3. opposite acceleration