Abberation

Abberation-n
1-a departure from what is normal or desirable
2-a temporary departure from somebody's normal mental state
3-a defect in a lens or mirror, causing a distorted image or one with colored edges
4a small periodic change in the apparent position of a star or other astronomical object, caused by the motion of the Earth around the sun.

Synonyms
deviation
abnormality
anomaly
irregularity
peculiarity
eccentricity
oddness
normality (antonym)