Aberration means a deviation from the standard, typical or customary way.
Aberration is a noun.
Synonyms: abnormality, oddity, curiosity, deviation, unconformity, irregularity.
Antonyms: normality, conformity, regularity.
A snowstorm in the desert is an aberration.
Even I was surprised at my aberrant score in the maths exam; I usually get more in maths.
Mr.Ravi's negative attitude is an aberration; he is usually very positive.