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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.
The definition of obsession is: the inability of a person to stop thinking about a particular topic or feeling a certain emotion without a high amount of anxiety. When obsessed, an individual continues the obsession in order to avoid the consequent anxiety.