Deviation from the common rule; an irregularity; anything anomalous.
- 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.