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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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
And it made one think about the fluctuation of dance styles.
Gold and his colleagues began their research on lab rats believing that
  neurotransmitter fluctuation modulated memory formation.
Though the fluctuation is not vast, it is enough to make a difference from peak
  to trough.
We have seen only a slight fluctuation in support for either side during this
  debate.
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