[noun] an instance of change; the rate or magnitude of change Synonyms: fluctuation
[noun] an activity that varies from a norm or standard; "any variation in his routine was immediately reported" Synonyms: variance
[noun] a repetition of a musical theme in which it is modified or embellished
[noun] something a little different from others of the same type; "an experimental version of the night fighter"; "an emery wheel is a modern variant of the grindstone"; "the boy is a younger edition of his father" Synonyms: version, variant, edition
[noun] an artifact that deviates from a norm or standard; "he patented a variation on the sandal"