plural fluctuations
Definition of fluctuation
: an act or instance of fluctuating : an irregular shifting back and forth or up and down in the level, strength, or value of something
Small fluctuations in prices are to be expected. Some fluctuation in real estate values is not unusual. North American species in general, having contended with blazing July days and frosty September nights as they evolved, are much more tolerant of temperature fluctuations than tropical species are.— Jonathan Franzen
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Merriam-Webster unabridged
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Time Traveler for fluctuation
The first known use of fluctuation was in the 15th century
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