Main Entry: ab·er·ra·tion

Pronunciation: \ˌab-ə-ˈrā-shən\

Function: noun

1 : failure of a mirror, refracting surface, or lens to produce exact point-to-point correspondence between an object and its image
2 : unsoundness or disorder of the mind
3 : an aberrant organ or individual

—ab·er·ra·tion·al \-shnəl, -shən-əl\ adjective