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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.
Eccentricity(noun) the ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis. Eccentricity(noun) the ratio of the distance of the center of the orbit of a heavenly body from the center of the body round which it revolves to the semi-transverse axis of the orbit. Eccentricity(noun) the distance of the center of figure of a body, as of an eccentric, from an axis about which it turns; the throw.