oscillation - definition and synonyms

noun 

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/ˌɒsɪˈleɪʃ(ə)n/
singularoscillation
pluraloscillations
  1. 1
    [countable/uncountable] science a repeated movement from side to side at a steady speed
    1. a.
      science a frequent change in size, strength, or direction between two limits
  2. 2
    [uncountable] formal the process of continuously changing your feelings, opinions, or decisions from one extreme position to the other