Deviation or departure from the normal or common order, form, or rule.
One that is peculiar, irregular, abnormal, or difficult to classify:
"Both men are anomalies: they have . . . likable personalities but each has made his reputation as a heavy"
(David Pauly).
Astronomy The angular deviation, as observed from the sun, of a planet from its perihelion.
OTHER FORMS:
a·noma·listic
(Adjective),
a·noma·listi·cal·ly
(Adverb)