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fluc·tu·ate (flŭḱchōō-āt́)

[Latin flūctuāre, flūctuāt-, from flūctus, a flowing, from past participle of fluere, to flow.]

verb: -at·ed, -at·ing, -ates. 

intransitive verb 

  1. To vary irregularly. See synonyms at swing
  2. To rise and fall in or as if in waves; undulate.

transitive verb 

To cause to rise and fall or vary irregularly.

derivatives

flućtu·ant
adjective
flućtu·átion
noun