An Etymological Dictionary of Astronomy and Astrophysics

1. An imperfection in the imaging properties of a → lens or → mirror.
   The main aberrations are → chromatic aberration, → spherical aberration, → coma, → astigmatism, → distortion, and → field curvature.
   

2. → aberration of starlight.
   

See also: → aberration angle→ aberration constan→ aberration of starlight→ aberration orbit→ annual aberration→ chromatic aberration→ constant of aberration→ diurnal aberration→ optical aberration→ planetary aberration→ relativistic aberration→ secular aberration→ spherical aberration→ stellar aberration.

Etymology (EN): Aberration, from L. aberrationem, from aberrare “go astray,” → aberrate.

Etymology (PE): Birâheš, from birâidan, → aberrate.