Generally, eccentric means 'out of the center', as opposed to concentric.
In mathematics, eccentricity is a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being
circular.
In mechanical engineering, an eccentric is a wheel that rotates on an axle that is displaced from the focus of the circle
described by the wheel—in other words, a mechanical motion that can operate either as a cam or a crank, depending upon how it is driven.
In popular usage, eccentricity refers
to unusual or odd behavior on the part of a person, as opposed to being normal.
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