anomaly

n. exception; deviation; strangeness; something which is out of the ordinary

Anomaly may refer to:AstronomyEccentric anomaly, the angle between the direction of periapsis and the current position of an object on its orbitFlyby anomaly, an unexpected energy increase during Earth flybys of satellitesMean anomaly, a measure of time in the study of orbital dynamicsPioneer anomaly, the observed deviation of the trajectories of various unmanned spacecraftSouth Atlantic Anomaly, the region where Earth's inner van Allen radiation belt makes its closest approach to the planet's surfaceTrue anomaly, the angle between the direction of periapsis and the current position of an object on its orbit
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Anomaly /anom·a·ly/ marked deviation from normal, especially as a result of congenital or hereditary defects. [more]Anomaly - Community and Resources

Noun
1. deviation from the normal or common order or form or rule
(synonym) anomalousness
(hypernym) abnormality, abnormalcy, abnormal condition
(hyponym) birth defect, congenital anomaly, congenital defect, congenital disorder, congenital abnormality
2. a person who is unusual
(synonym) unusual person
(hypernym) person, individual, someone, somebody, mortal, human, soul
(hyponym) anachronism
3. (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)
(hypernym) position, place
(classification) astronomy, uranology

(n.)
The angular distance of a planet from its perihelion, as seen from the sun. This is the true anomaly. The eccentric anomaly is a corresponding angle at the center of the elliptic orbit of the planet. The mean anomaly is what the anomaly would be if the planet's angular motion were uniform.
  

(n.)
The angle measuring apparent irregularities in the motion of a planet.
  

(n.)
Deviation from the common rule; an irregularity; anything anomalous.
  

(n.)
Any deviation from the essential characteristics of a specific type.