acceleration - definition and synonyms

noun 

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/əkˌseləˈreɪʃ(ə)n/
  1. 1
    [singular/uncountable] an increase in the rate at which something happens, changes, or grows

    Economic growth slowed down sharply after three months of acceleration.

    acceleration of:

    The report calls for an acceleration of reforms in the prison service.

  2. 3
    [uncountable] science the increase in speed of a moving object