Definition of perturbation noun from the Oxford Advanced Learner's Dictionary

     

    perturbation

     noun
    noun
    BrE BrE//ˌpɜːtəˈbeɪʃn//
     
    ; NAmE NAmE//ˌpɜːrtərˈbeɪʃn//
     
     
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  1. 1[uncountable] (formal) the state of feeling anxious about something that has happened synonym alarm
  2. 2 [countable, uncountable] (specialist) a small change in the quality, behaviour or movement of something temperature perturbations
  3. Word Origin late Middle English: from Latin perturbatio(n-), from the verb perturbare ‘disturb greatly’, from per- ‘completely’ + turbare ‘disturb’.
See the Oxford Advanced American Dictionary entry: perturbation