Eccentricity

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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 astrodynamics eccentricity of an orbit can be calculated from orbital state vectors as an absolute value of eccentricity vector or using other methods based on orbital energy and angular momentum.
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.

de:Exzentrizität eo:Discentreco fr:Excentricité it:Eccentricità nl:Excentriek ja:離心率 pl:Ekscentryczność (fizyka) tr:Eksantriklik