Aberration

• An abnormality of chromosomes

• A disorder in one's mental state (see Mental illness)

In optics:

• 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