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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 means, literally, off center. The term originated with astronomy. Later, it came to be used in mechanics, to describe a wheel or gear which rotates about an ax â¦ le which is not at its center. (To understand how eccentric motion can be useful. See animation of a automobile cam in related link below.) Around 1620, the term was first applied figuratively, to describe a thing which was odd or unusual.