Definition of fluctuate in English:



  • Rise and fall irregularly in number or amount.

    ‘trade with other countries tends to fluctuate from year to year’
    ‘a fluctuating level of demand’
    • ‘Bond funds also pay income, usually on a monthly basis, but the amount you receive can fluctuate.’
    • ‘He requires large doses of narcotics for pain control and his level of consciousness fluctuates greatly.’
    • ‘The amount owed each month fluctuated with holidays, missed lessons and book expenses.’
    • ‘Mood gently fluctuates as the light levels change, complemented by the rhythm of the mist continually settling and rising.’
    • ‘Oxygen levels have fluctuated since the air became oxygen rich, but not by much.’
    • ‘As the general price level fluctuates, the dollar is bound to become a unit of different magnitude.’
    • ‘Union membership has fluctuated as different industries rise and decline, governments and generations change.’
    • ‘Volume levels fluctuate wildly, leading to constant struggles with the remote.’
    • ‘The original volume levels fluctuate, particularly when the single takes are employed.’
    • ‘They stare into an infinite chasm that opens up in the face of using a limited amount of notes that fluctuate from serene moments to bawling noise storms.’
    • ‘Symptoms seem to vary from year to year, and crop levels fluctuate.’
    • ‘Avoid alcohol because it can cause your blood sugar levels to fluctuate and induces irritability.’
    • ‘Prices then rose to £25 in the 1730s, and fluctuated about that level into the 1790s.’
    • ‘Moods and emotions are varied and fluctuating as you deal with adversaries and rally around friends.’
    • ‘However, experts confirmed that levels of this protein fluctuated naturally.’
    • ‘Thoreau discovered that the level of the pond fluctuates by about five feet over a period of 25 years.’
    • ‘It also shows a person's ability to govern and fluctuate between rising and falling.’
    • ‘The amount of soap required by MCC fluctuates with the demand.’
    • ‘Jobs in industry have fluctuated with the level of the pound.’
    • ‘This means that the absolute amount of re-synthesized sucrose fluctuates considerably with fruit age, by as much as a factor of 3.’
    vary, differ, shift, change, alter, waver, swing, oscillate, alternate, rise and fall, go up and down, see-saw, yo-yo, be unstable, be unsteady
    View synonyms


Mid 17th century (earlier ( late Middle English) as fluctuation): from Latin fluctuat- undulated, from the verb fluctuare, from fluctus flow, current, wave, from fluere to flow.