Variation

an instance of change

an activity that varies from a norm or standard

a repetition of a musical theme in which it is modified or embellished

something a little different from others of the same type

an artifact that deviates from a norm or standard

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)

(biology) an organism that has characteristics resulting from chromosomal alteration

(ballet) a solo dance or dance figure

the act of changing or altering something slightly but noticeably from the norm or standard