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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.
From Medieval Latin eccentricus, derived from Greek ekkentros, out of the center, from ek-, ex- out of + kentron, center. Eccentric first appeared in English essays as a neologism in 1551 as an astronomical term meaning a circle in which the earth, sun, etc. deviates from its center.. Five years later, in 1556, an adjective form of the word was used.