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Definition of aberration

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top: spherical aberration
bottom: chromatic aberration
A. red
B. yellow
ab·er·ra·tion  audio  (b-rshn) KEY 

  1. A deviation from the proper or expected course. See Synonyms at deviation.
  2. A departure from the normal or typical: events that were aberrations from the norm.
  3. Psychology A disorder or abnormal alteration in one's mental state.
    1. A defect of focus, such as blurring in an image.
    2. An imperfect image caused by a physical defect in an optical element, as in a lens.
  4. 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.
  5. Genetics A deviation in the normal structure or number of chromosomes in an organism.

Latin aberrti, aberrtin-, diversion, from aberrtus, past participle of aberrre, to go astray : ab-, away from ; see ab-1 + errre, to stray; see ers- in Indo-European roots

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