the degree of divergence of an ellipse from a circle.
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How to use ellipticity in a sentence
The fact that there is no measurable ellipticity is, I think, one which on first consideration would not be expected.The Birth-Time of the World and Other Scientific Essays | J. (John) Joly
We may consider this spheroid to be that of the earth, the ellipticity being greatly exaggerated.
The ellipticity of Jupiter indicated by these figures is sufficiently marked to be obvious without any refined measures.The Story of the Heavens | Robert Stawell Ball
Their ovalness or "ellipticity" is, however, in each case not by any means of the same degree.Astronomy of To-day | Cecil G. Dolmage
To put it paradoxically, it is an ellipse which has no ellipticity, an oval without any ovalness!Astronomy of To-day | Cecil G. Dolmage
British Dictionary definitions for ellipticity
the degree of deviation from a circle or sphere of an elliptical or ellipsoidal shape or path, measured as the ratio of the major to the minor axes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012