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say it: fluhk-choo-AY-shuhn
fluctuation is a noun meaning "a wave motion". It carries 3 recorded senses.
an instance of change; the rate or magnitude of change
the quality of being unsteady and subject to changes
“he kept a record of price fluctuations”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fluctuation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.