say it: ab-ur-AY-shuhn
aberration is a noun meaning "a state or condition markedly different from the norm". It carries 3 recorded senses.
a state or condition markedly different from the norm
a disorder in one's mental state
an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for aberration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.