Part of speech: noun

Frequent irregular change; varying movement or action.

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Usage examples "fluctuation":

  1. After a good deal of fluctuation, from 29 degrees 31 down to so low a fall as 28 degrees 64, the barometrical pressure of the dowager's temper had returned to its abnormal state, during the excited conversation that had gone on all the time; but the next morning, however, when Markworth made his appearance, the dowager's barometer sank again to a very low depth indeed. - "Caught in a Trap", John C. Hutcheson.
  2. In other kinds of work there is a very large fluctuation, under ordinary conditions, and in such cases it is necessary to have more help in the employment department. - "Analyzing Character", Katherine M. H. Blackford and Arthur Newcomb.
  3. The face of physical nature in the United States shares this incessant fluctuation, and the landscape is as variable as the habits of the population. - "The Earth as Modified by Human Action", George P. Marsh.