n. pl.   a·nom·a·lies 1.  Deviation or departure from the normal or common order, form, or rule.
2.  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).
3.  Astronomy   The angular deviation, as observed from the sun, of a planet from its perihelion.