Definition of fluctuation in US English:

fluctuation

noun

  • An irregular rising and falling in number or amount; a variation.

    ‘fluctuations in the yearly values could be caused by a variety of factors’
    ‘the current fluctuation in energy prices’
    • ‘Supply and demand regulate nothing but the temporary fluctuations of market prices.’
    • ‘How many cents constitute a dollar is no more subject to daily fluctuation and uncertainty than inches in terms of yards.’
    • ‘They are unique because there is no other retail section in which price fluctuations are the accepted norm.’
    • ‘This system stabilizes our market more than the US market and fluctuations have not been as great.’
    • ‘See also here for the real explanation of earth's temperature fluctuations.’
    variation, shift, change, alteration, swing, movement, oscillation, undulation, alternation, rise and fall, rising and falling, see-sawing, yo-yoing, instability, unsteadiness
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Pronunciation

fluctuation

/ˌfləkCHəˈwāSH(ə)n//ˌfləktʃəˈweɪʃ(ə)n/