American English

Definition of fluctuate verb from the Oxford Advanced American Dictionary

      

    fluctuate

     verb
    verb
    NAmE//ˈflʌktʃuˌeɪt//
     
    [intransitive]Verb Forms present simple I / you / we / they fluctuate
     
    he / she / it fluctuates
     
    past simple fluctuated
     
    -ing form fluctuating
     
     
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  1. 1to change frequently in size, amount, quality, etc., especially from one extreme to another synonym vary
  2. 2 fluctuating prices The documentary follows the fluctuating fortunes of one marketing company. fluctuate between A and B During the crisis, oil prices fluctuated between $40 and $80 a barrel. + adv./prep. Temperatures can fluctuate by as much as 10 degrees. My weight fluctuated wildly depending on how much I ate. My mood seems to fluctuate from day to day. The rate of inflation has been fluctuating around 4% for some time.
NAmE//ˌflʌktʃuˈeɪʃn//
 
noun [countable, uncountable] fluctuation (in/of something) wild fluctuations in interest rates
See the Oxford Advanced Learner's Dictionary entry: fluctuate