Definition of "fluctuate" []

• 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.

• "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."