anomaly

The definition of an anomaly is a person or thing that has an abnormality or strays from common rules or methods.

(noun)

A person born with two heads is an example of an anomaly.

See anomaly in Webster's New World College Dictionary

noun pl. anomalies

departure from the regular arrangement, general rule, or usual method; abnormality
anything anomalous
Astron. a measurement used for any orbiting body, as a planet's angular distance around its orbit from its perihelion, taken as if viewed from the sun

Origin: L anomalia < Gr anōmalia, inequality: see anomalous

See anomaly in American Heritage Dictionary 4

noun pl. a·nom·a·lies

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.

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