*Choose Index below for a list of all words and phrases defined in this glossary.*

**eccentricity** - [Euclidean geometry] A measure of how much an ellipse deviates from a circle, expressed as the ratio of the distance between the center and one focus of an ellipsoid to the length of its semimajor axis. The square of the eccentricity (e2) is commonly used with the semimajor axis a to define a spheroid.

[Category=Geospatial ]

*Source: esri, 08 April 2012 09:15:15, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation *

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