From HomoExcelsior

1. deviation
2. events that were aberrations from the norm.
3. A disorder or abnormal alteration in one's mental state.
4. A defect of focus, such as blurring in an image.
5. An imperfect image caused by a physical defect in an optical element, as in a lens.
6. The apparent displacement of the position of a celestial body in the direction of motion of an observer on Earth, caused by the motion of Earth and the finite velocity of light.
7. A deviation in the normal structure or number of chromosomes in an organism.

---