fluctuation

[fluhk-choo-ey-shuhn]
noun
1.
continual change from one point or condition to another.
2.
wavelike motion; undulation.
3.
Genetics. a body variation due to environmental factors and not inherited.

Origin:
1400–50; late Middle English < Latin fluctuātiōn- (stem of fluctuātiō) a fluctuation, wavering. See fluctuate, -ion

nonfluctuation, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fluctuation (ˌflʌktjʊˈeɪʃən)
 
n
1.  constant change; vacillation; instability
2.  undulation
3.  a variation in an animal or plant that is determined by environment rather than heredity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

fluctuation
mid-15c., from L. fluctuationem (nom. fluctuatio), from fluctuare "to undulate," from fluctus "wave," from pp. of fluere "to flow" (see fluent).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They tolerate extreme temperature fluctuations, little water, and tricky
  northern exposures.
There are weekends on the college football schedule when flurries of upsets
  cause wild fluctuations in poll voting.
Its long summer days and equally long winter nights punctuate extreme
  fluctuations in temperature and weather throughout the year.
From fall through spring, the canyon is known for drastic fluctuations in
  weather conditions.
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