Aberration
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Aberration has several meanings:

• Optical aberration, an imperfection in image formation by an optical system
  • Spherical aberration, which occurs when light rays strike a lens or mirror near its edge
  • Chromatic aberration, caused by differences in refractive index for different wavelengths of light
  • Defocus aberration, which occurs when a system is out of focus

In relativity:

• Aberration of light, an astronomical phenomenon which produces an apparent motion of celestial objects
• Relativistic aberration, aberration of light relating to near light speeds

In entertainment:

• Aberration (Dungeons & Dragons), a creature type in the role-playing game
• Aberration (film), a horror movie

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