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noun 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 1:29966. Note: Some writers use ellipticity as the ratio of the difference of the two semiaxes to the minor axis, instead of the major.
Collaborative International Dictionary of English 0.48
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