ellipticity

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ellipticity [ē‚lip′tis·əd·ē]

(astronomy)

The difference between the equatorial and polar radii of a planet divided by the mean radius.

(electronics)

axial ratio

(mathematics)

Also known as oblateness.

For an ellipse, the difference between the semimajor and semiminor axes of the ellipse, divided by the semimajor axis.

For an oblate spheroid, the difference between the equatorial diameter and the axis of revolution, divided by the equatorial diameter.

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ellipticity