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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.
Astronomy and celestial mechanics. 1  In astronomy, an anomaly of an elliptical orbit, generally measured with respect to an apsis, usually the periapsis. 2  Eccentric anomaly, an intermediate value used to compute the position of a celestial object as a function of time.