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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.
Definition of Eccentric Weight Training. Weight Training. Eccentric muscle action is a lengthening of the muscle while contracting. It is a braking force or is in opposition to an action that shortens the muscle. If you have your arm bent in a biceps curl and straighten your arm from the curl position, the movement is eccentric.