fluctuate

[fluhk-choo-eyt]

verb (used without object), fluc·tu·at·ed, fluc·tu·at·ing.

to change continually; shift back and forth; vary irregularly: The price of gold fluctuated wildly last month.
to move back and forth in waves.

verb (used with object), fluc·tu·at·ed, fluc·tu·at·ing.

to cause to fluctuate.

Origin of fluctuate

1625–35; < Latin fluctuātus undulated, past participle of fluctuāre to flow, equivalent to fluctu(s) a flowing (derivative of fluere to flow) + -ātus -ate1
Related formsnon·fluc·tu·at·ing, adjectiveun·fluc·tu·at·ing, adjective

Synonyms for fluctuate

1. See waver1. 2. oscillate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for fluctuate

fluctuate

verb

to change or cause to change position constantly; be or make unstable; waver or vary
(intr) to rise and fall like a wave; undulate

Word Origin for fluctuate

C17: from Latin fluctuāre, from fluctus a wave, from fluere to flow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fluctuate
v.

1630s, from Latin fluctuatus, past participle of fluctuare "to undulate" (see fluctuation). Related: Fluctuated; fluctuates; fluctuating.

Online Etymology Dictionary, © 2010 Douglas Harper