eccentricity

== English == === Etymology === From eccentric +‎ -ity. === Pronunciation === (US) IPA(key): /ˌɛk.sɛnˈtɹɪs.ɪ.ti/, [ˌɛk.sənˈtɹɪs.ə.ɾi] === Noun === eccentricity (countable and uncountable, plural eccentricities) The quality of being eccentric or odd; any eccentric behaviour. (geometry) The ratio, constant for any particular conic section, of the distance of a point from the focus to its distance from the directrix. (astronomy) The eccentricity of the conic section (usually an ellipse) defined by the orbit of a given object around a reference object (such as that of a planet around the sun). (graph theory) The farthest distance from a vertex to any other vertex. ==== Translations ====