fluctuate

[fluhk-choo-eyt]
verb (used without object), fluctuated, fluctuating.
1.
to change continually; shift back and forth; vary irregularly: The price of gold fluctuated wildly last month.
2.
to move back and forth in waves.
verb (used with object), fluctuated, fluctuating.
3.
to cause to fluctuate.

Origin:
1625–35; < Latin fluctuātus undulated, past participle of fluctuāre to flow, equivalent to fluctu(s) a flowing (derivative of fluere to flow) + -ātus -ate1

nonfluctuating, adjective
unfluctuating, adjective


1. See waver1. 2. oscillate.
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World English Dictionary
fluctuate (ˈflʌktjʊˌeɪt)
 
vb
1.  to change or cause to change position constantly; be or make unstable; waver or vary
2.  (intr) to rise and fall like a wave; undulate
 
[C17: from Latin fluctuāre, from fluctus a wave, from fluere to flow]

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Etymonline
Word Origin & History

fluctuate
1630s, from L. fluctuat-, pp. stem of fluctuare "to undulate" (see fluctuation). Related: Fluctuated; fluctuates; fluctuating.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fluctuate fluc·tu·ate (flŭk'chōō-āt')
v. fluc·tu·at·ed, fluc·tu·at·ing, fluc·tu·ates

  1. To vary irregularly.

  2. To rise and fall in waves; undulate.


fluc'tu·a'tion n.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
The temperature range in which the yeast is active also fluctuates between
  strains.
The volume fluctuates but the flow of suggestions is constant.
And the number of posts per day fluctuates, but doesn't seem to have been
  rising on average over the last couple of weeks.
First, the yuan is only pegged to the dollar and fluctuates with the dollar
  against other currencies.
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