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English definition of “decelerate”

decelerate

verb [I] uk   /ˌdiːˈsel.ər.eɪt/ us    /-ə.reɪt/
to reduce the speed that a vehicle is travelling at: The car decelerated at the sight of the police car.Increasing and decreasing speed of motion to happen or make something happen more slowlyIncreasing and decreasing speed of motion
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(Definition of decelerate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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