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aberration British & World English

A departure from what is normal, usual, or expected, typically an unwelcome one

aberration English Thesaurus

economists said the figure was an aberration

chromatic aberration British & World English

The effect produced by the refraction of different wavelengths of light through slightly different angles, resulting in a failure to focus

spherical aberration British & World English

A loss of definition in the image arising from the surface geometry of a spherical mirror or lens