n.1 a departure from what is normal or accepted or regarded as right.
2 a moral or mental lapse.
3 Biol. deviation from a normal type.
4 Optics the failure of rays to converge at one focus because of a defect in a lens or mirror.
5 Astron. the apparent displacement of a celestial body, meteor, etc., caused by the observer's velocity.
Etymology: L aberratio (as ABERRANT)