What is the definition of fluxuation?

Answer 1

"Fluxuation" is a non-word, an unacceptable misspelling of the proper word, "fluctuation". The roots of "fluctuate" and "flux" are, of course, the same; however, the verb form used to mean "to be in flux or to exhibit variability" is "fluctuate". There is no verb form spelled with an "x".