• (America) IPA: /ˌɛk.sɛnˈtɹɪs.ɪ.ti/, [ˌɛk.sənˈtɹɪs.ə.ɾi]


  1. The quality of being eccentric or odd; any eccentric behaviour.
  2. (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.
  3. (astronomy) The distance of the centre of a planet's orbit from the centre of the sun.
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