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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. Eccentricity: how much a conic section (a circle, ellipse, parabola or hyperbola) varies from being circular. A circle has an eccentricity of zero, so the eccentricity shows you how un-circular the curve is.