Eccentricity n. : The state of being eccentric; deviation from the customary line of conduct; oddity.

Eccentricity n. : The ratio of the distance between the center and the focus of an ellipse or hyperbola to its semi-transverse axis.

Eccentricity n. : 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.

Eccentricity n. : The distance of the center of figure of a body, as of an eccentric, from an axis about which it turns; the throw.

Example:
How do i find orbital period and distance using the distance and orbital Eccentricity?

Taxonomy
eccentricity, orbit, orbital eccentricity, shape, values, eccentricity vector, Earth's orbit, free encyclopedia, northern hemisphere, ellipse, a perfect circle, circular orbit, the planets, elliptical orbits, projection angle, of the Earth, the solar system, duration.

Defination from the web:
Eccentricity may be interpreted as a measure of how much this shape deviates from a circle. Under standard assumptions eccentricity () is strictly defined for all circular, elliptic, parabolic and hyperbolic orbits and may take following ...