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deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd: eccentric conduct; an eccentric person. 2. Geometry. not having the same center; not concentric: used especially of two circles or spheres at least one of which contains the centers of both. 3. (of an axis, axle, etc.) not situated in the center.
Princeton's WordNet(3.00 / 1 vote)Rate this definition: 1  anomaly, anomalousness(noun) deviation from the normal or common order or form or rule. 2  anomaly, unusual person(noun) a person who is unusual. 3  anomaly(noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)