Eccentricity Ec`cen*tric"i*ty, n.; pl. {Eccentricities}. [Cf. F. excentricit['e].] 1. The state of being eccentric; deviation from the customary line of conduct; oddity. [1913 Webster]

2. (Math.) The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis. [1913 Webster]

3. (Astron.) The ratio of the distance of the center of the orbit of a heavenly body from the center of the body round which it revolves to the semi-transverse axis of the orbit. [1913 Webster]

4. (Mech.) The distance of the center of figure of a body, as of an eccentric, from an axis about which it turns; the throw. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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