aberration n noun
1 an unwelcome deviation from what is normal. Øinformal a temporary mental lapse. ØBiology a characteristic that deviates from the normal type.
2 Optics the failure of rays to converge at one focus because of a defect in a lens or mirror.
3 Astronomy the apparent displacement of a celestial object from its true position, caused by the relative motion of the observer and the object.
DERIVATIVES
aberrational adjective
ORIGIN
C16: from Latin aberratio(n-), from aberrare 'to stray'.
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