To vary irregularly. See Synonyms at swing.(verb-intransitive)
To rise and fall in or as if in waves; undulate.(verb-intransitive)
To cause to rise and fall or vary irregularly.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "fluctuate" in a sentence
"Payments in dollar terms fluctuate with currency markets."
"A clear conception means a determinate conception; one which does not fluctuate, which is not one thing to-day and another to-morrow, but remains fixed and invariable, except when, from the progress of our knowledge, or the correction of some error, we consciously add to it or alter it."
""Balances fluctuate, which is why we offer clients the option of an average combined monthly balance in their checking and savings account to avoid a service fee," Steve Troutner, Citi's head of consumer and small-business banking, said in an e-mail statement."