[ab-uh-rey-shuh
n] 
| 1. | the act of departing from the right, normal, or usual course. |
| 2. | the act of deviating from the ordinary, usual, or normal type. |
| 3. | deviation from truth or moral rectitude. |
| 4. | mental irregularity or disorder, esp. of a minor or temporary nature; lapse from a sound mental state. |
| 5. | Astronomy. apparent displacement of a heavenly body, owing to the motion of the earth in its orbit. |
| 6. | Optics. any disturbance of the rays of a pencil of light such that they can no longer be brought to a sharp focus or form a clear image. |
| 7. | Photography. a defect in a camera lens or lens system, due to flaws in design, material, or construction, that can distort the image. |
aberration ab·er·ra·tion (āb'ə-rā'shən)
n.
A departure from the normal or typical.
A psychological disorder or abnormal alteration in one's mental state.
A defect of focus, such as blurring in an image.
An imperfect image caused by a physical defect in an optical element, as in a lens.
A deviation in the normal genetic structure or number of chromosomes in an organism.