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# ellipticity

[ih-lip-tis-i-tee, el-ip-, ee-lip-] /ɪ lɪpˈtɪs ɪ ti, ˌɛl ɪp-, ˌi lɪp-/
noun
1.
the degree of divergence of an ellipse from a circle.
Origin of ellipticity
1745-1755
1745-55; elliptic- (see elliptical) + -ity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for ellipticity
Historical Examples
• The form of our globe, which is that of an oblate spheroid with an ellipticity of about 1⁄299.

William Henry Smyth
• The specific mark of this family is the flattening or ellipticity.

A.C. Seward and Others
• Its two diameters are to one another as 17 is to 16; the ellipticity of its disk is manifest to simple inspection.

Oliver Lodge
• The extensive sets of observations of gravity provided the basis of calculations of the ellipticity of the earth.

• When these were submitted to calculation, each led to the same value of the ellipticity.

Charles Dudley Warner
• This fraction is denominated the ellipticity of the earth,—being the excess of the equatorial over the polar diameter.

Denison Olmsted
• The specific difference in the new family, denoted in the general sketch by b, is this ellipticity of the equator.

A.C. Seward and Others
• Their ovalness or "ellipticity" is, however, in each case not by any means of the same degree.

Cecil G. Dolmage
• To put it paradoxically, it is an ellipse which has no ellipticity, an oval without any ovalness!

Cecil G. Dolmage
• The orbits of Mercury and Mars have an appearance of ellipticity because the sun does not occupy the central point in the diagram.

Mark Wicks
British Dictionary definitions for ellipticity

## ellipticity

/ɪlɪpˈtɪsɪtɪ; ˌɛl-/
noun
1.
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