/ ˈflʌktʃueɪt; NAmE / verb
[ v ] fluctuate (between A and B) to change frequently in size, amount, quality, etc., especially from one extreme to another
SYN vary :
fluctuating prices
During the crisis, oil prices fluctuated between $20 and $40 a barrel.
Temperatures can fluctuate by as much as 10 degrees.
My mood seems to fluctuate from day to day.
► fluc·tu·ation / ˌflʌktʃuˈeɪʃn; NAmE / noun [ C , U ] fluctuation (in / of sth) :
wild fluctuations in interest rates
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WORD ORIGIN
mid 17th cent. (earlier ( late Middle English ) as fluctuation ): from Latin fluctuat- undulated, from the verb fluctuare , from fluctus flow, current, wave, from fluere to flow.