Oxford Dictionary English

    decelerate

    verb
    verb
    BrE BrE//ˌdiːˈseləreɪt//
    ; NAmE NAmE//ˌdiːˈseləreɪt//
    (formal)Verb Forms present simple I / you / we / they decelerate
    BrE BrE//ˌdiːˈseləreɪt//
    ; NAmE NAmE//ˌdiːˈseləreɪt//
     he / she / it decelerates
    BrE BrE//ˌdiːˈseləreɪts//
    ; NAmE NAmE//ˌdiːˈseləreɪts//
     past simple decelerated
    BrE BrE//ˌdiːˈseləreɪtɪd//
    ; NAmE NAmE//ˌdiːˈseləreɪtɪd//
     past participle decelerated
    BrE BrE//ˌdiːˈseləreɪtɪd//
    ; NAmE NAmE//ˌdiːˈseləreɪtɪd//
     -ing form decelerating
    BrE BrE//ˌdiːˈseləreɪtɪŋ//
    ; NAmE NAmE//ˌdiːˈseləreɪtɪŋ//
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  1. 1[intransitive, transitive] decelerate (something) to reduce the speed at which a vehicle is travelling
  2. 2[intransitive, transitive] decelerate (something) to become or make something become slower synonym slow down Economic growth decelerated sharply in June.
    3. opposite accelerate     Word Originlate 19th cent.: from de- (expressing removal) + a shortened form of accelerate.
See decelerate in the Oxford Advanced American Dictionary
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