Definition of "Variation" :
noun: an activity that varies from a norm or standard
"Any variation in his routine was immediately reported."
noun: the act of changing or altering something slightly but noticeably from the norm or standard
"Who is responsible for these variations in taxation?."
noun: (ballet) a solo dance or dance figure
noun: an artifact that deviates from a norm or standard
"He patented a variation on the sandal."
noun: something a little different from others of the same type
"An emery wheel is the modern variation of a grindstone."
noun: a repetition of a musical theme in which it is modified or embellished
noun: an instance of change; the rate or magnitude of change
noun: (biology) an organism that has characteristics resulting from chromosomal alteration
noun: (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)
noun: the process of varying or being varied
noun: the angle (at a particular location) between magnetic north and true north