Definition of perturbation noun from the Oxford Advanced American Dictionary

     

    perturbation

     noun
    noun
    NAmE//ˌpərtərˈbeɪʃn//
     
     
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  1. 1[uncountable] (formal) the state of feeling anxious about something that has happened synonym alarm
  2. 2[countable, uncountable] (technology) a small change in the quality, behavior, or movement of something temperature perturbations
See the Oxford Advanced Learner's Dictionary entry: perturbation