Eccentricity /(?)/

pl. Eccentricities

1. The state of being eccentric; deviation from the customary line of conduct; oddity.
2. The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis. (Math.)
3. 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. (Astron.)
4. The distance of the center of figure of a body, as of an eccentric, from an axis about which it turns; the throw. (Mech.)