
1) Bulginess 2) Oblateness 3) Roundedness
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https://www.crosswordclues.com/clue/ellipticity

1) Oblateness
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https://www.crosswordclues.com/clue/ellipticity

• (n.) Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is /.
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http://thinkexist.com/dictionary/meaning/ellipticity/

A measure of the amount by which an object, such as a planet or a galaxy, deviates from a perfect sphere; also known as oblateness. It is found by subtracting the polar diameter from the equatorial diameter, then dividing by the equatorial diameter. Ellipticity is typically an indication of how fast...
Found on
http://www.daviddarling.info/encyclopedia/E/ellipticity.html

Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is 1/29966. ... Some writers use ellipticity as the ratio of the difference of the two semiaxes...
Found on
http://www.encyclo.co.uk/local/20973
El`lip·tic'i·ty noun [ Confer French
ellipticité .] Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the
ellipticity...Found on
http://www.encyclo.co.uk/webster/E/22

ellipticity, ellipticities The deviation or degree of deviation of an ellipse or ellipsoid from a perfect circle or sphere. Ellipticity is measured as the ratio of the major axis to the minor axis of the ellipse or ellipsoid.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1194/

the degree of divergence of an ellipse from a circle.
Found on
https://www.infoplease.com/dictionary/ellipticity
No exact match found.