2. Anything that is peculiar, strange, irregular, abnormal, or difficult to classify.
3. In astronomy, the angle in a planet's orbit or the angle between a planet's position, the sun, and the point in the planet's orbit when it is closest to the sun; or the angular deviation, as observed from the sun, of a planet from its perihelion.
4. An odd, peculiar, or strange condition, situation, quality, etc. and an incongruity or inconsistency.
5. People or things that are different from what is usual, or not in agreement with something else and therefore not satisfactory: "The government's statistical anomalies can make it difficult to compare economic data from one year to the next."
6. Abnormalities or deviations: "Anomalies is a word among computer people when complex systems produce outputs that are inexplicable or unexplainable."
7. Etymology: from Latin anomalia, from Greek anomalia, noun of quality from anomalos, "uneven, irregular"; from an-, "not" + homalos, "even", from homos, "same".
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A birth defect caused by a structural abnormality or a marked deviation from the average or norm; anything that is structurally unusual or irregular or contrary to a general rule; such as, a congenital defect.
There are four clinically significant medical types of anomalies: malformation, disruption, deformation, and dysplasia (abnormal in form; for example, retinal dysplasia is abnormal formation of the retina during embryonic development).