ˌæbəˈreɪʃən 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)]