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1. Deviation from perfect circular or spherical form toward elliptic or ellipsoidal form.
2. The degree of this deviation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Mathematics) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
el•lip•tic•i•ty(ɪ lɪpˈtɪs ɪ ti, ˌɛl ɪp-, ˌi lɪp-)
the degree of divergence of an ellipse from a circle.
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|Noun||1.||ellipticity - the property possessed by a round shape that is flattened at the poles; "the oblateness of the planet"|
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