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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The amplitude and pitch of the buzzing sometimes shifted, and the intervals
  between tones would fluctuate.
As a result, a player's total salary can fluctuate extensively from one year to
  the next.
Day-to-day pollution levels have tended to fluctuate.
Snowshoe hare populations fluctuate cyclically about once a decade-possibly
  because of disease.
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