# Eccentricity meaning

ĕksĕn-trĭsĭ-tē
Frequency:
Eccentricity is defined as the state or quality of having an odd or unusual manner.

Dressing in a way that is considered to be strange and out-of-the-ordinary is an example of eccentricity.

noun
(math.) The ratio of the distances from any point of a conic section to the focus and to the directrix: the value of this ratio determines the type of conic section (zero = circle, between zero and one = ellipse, one = parabola, more than one = hyperbola)
noun
(mathematics) The ratio of the distance of any point on a conic section from a focus to its distance from the corresponding directrix. This ratio is constant for any particular conic section.
noun
The state, quality, or amount of being eccentric.
noun
(mech.) The distance between the center of a shaft and the center of its eccentric wheel.
noun
The quality of being eccentric; any eccentric behaviour.
noun
(mathematics) The ratio, constant for any particular conic section, of the distance of a point from the focus to its distance from the directrix.

For an ellipse, the eccentricity is the ratio of the distance from the center to a focus divided by the length of the semi-major axis.

noun
An example or instance of eccentric behavior.
noun
A measure of the deviation of an elliptical path, especially an orbit, from a perfect circle. It is equal to the ratio of the distance between the foci of the ellipse to the length of the major axis of the ellipse (the distance between the two points farthest apart on the ellipse). Eccentricity ranges from zero (for a perfect circle) to values approaching 1 (highly elongated ellipses).
The ratio of the distance of any point on a conic section from a focus to its distance from the corresponding directrix. This ratio is constant for any particular conic section.