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