Definition of impetus noun from the Oxford Advanced American Dictionary

     

    impetus

     noun
    noun
    NAmE//ˈɪmpət̮əs//
     
     
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  1. 1 [uncountable, singular] something that encourages a process or activity to develop more quickly synonym stimulus The debate seems to have lost much of its initial impetus. impetus to something/to do something to give (a)new/fresh impetus to something The mayor's support will give (an) added impetus to the campaign against crime. impetus for something His articles provided the main impetus for change.
  2. 2[uncountable] (technology) the force or energy with which something moves
See the Oxford Advanced Learner's Dictionary entry: impetus