Noun

1. An instance of change; the rate or magnitude of change
2. An activity that varies from a norm or standard
3. A repetition of a musical theme in which it is modified or embellished
4. Something a little different from others of the same type
5. An artifact that deviates from a norm or standard
6. The angle (at a particular location) between magnetic north and true north
7. The process of varying or being varied
8. (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)
9. (biology) an organism that has characteristics resulting from chromosomal alteration
10. (ballet) a solo dance or dance figure
11. The act of changing or altering something slightly but noticeably from the norm or standard