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

  

fluctuation

 noun
noun
BrE BrE//ˌflʌktʃuˈeɪʃn//
 
; NAmE NAmE//ˌflʌktʃuˈeɪʃn//
 
[countable, uncountable]fluctuation (in/of something)
 
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one of several frequent changes in size, amount, quality, etc, especially from one extreme to another; the act of changing frequently like this wild fluctuations in interest rates the constant fluctuation of oil prices currency/temperature fluctuations