Aberration

An aberration is something that deviates from the normal way.

Aberration may refer to:

Optics and physics

Optical aberration, an imperfection in image formation by an optical system
Chromatic aberration, caused by differences in refractive index for different wavelengths of light, in contrast with monochromatic aberration, which occurs for all frequencies of light
Spherical aberration, which occurs when light rays pass through a lens near the edge
Defocus aberration, which occurs when a system is out of focus
Aberration of light, which produces an apparent motion of celestial objects
Relativistic aberration, the distortion of light at high velocities

aberratio or aberration, a rare (mutant) butterfly or moth wing pattern.
Chromosome abnormality, or aberration, a disruption in the normal chromosomal content of a cell
Cardiac aberrancy, aberration of the conduction of action potentials in the electrical conduction system of the heart