say it: ver-ee-AY-shuhn
variation is a noun meaning "an instance of change; the rate or magnitude of change". It carries 11 recorded senses.
an instance of change; the rate or magnitude of change
the angle (at a particular location) between magnetic north and true north
the process of varying or being varied
(astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)
astronomy
the act of changing or altering something slightly but noticeably from the norm or standard
“who is responsible for these variations in taxation?”
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 variation 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.