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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.
Eccentric comes to us through Middle English from the Medieval Latin word eccentricus, but it is ultimately derived from a combination of the Greek words ex, meaning out of, and kentron, meaning center.. The original meaning of eccentric in English was not having the same center (as in eccentric spheres).