eccentricity.
The quality of being eccentric or odd; any eccentric behaviour.
Meaning & usage
The quality of being eccentric or odd; any eccentric behaviour.
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.
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).
The farthest distance from a vertex to any other vertex.
Where this word comes from
Borrowed from Latin eccentricitās. By surface analysis, eccentric + -ity.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.