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.
[ L aberratio (as ABERRANT) ]