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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
Of course climate fluctuated in the past, yet species adapted and flourished.
Since then, the rates have fluctuated, but this is the first time the tax has been repealed altogether.
We do know, however, that shares fluctuated in value.
As the abundance of different seeds fluctuated, so too did the beak sizes.
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