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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 el·lip·tic·i·ty /ɪˌlɪpˈtɪsəti, (ˌ)ɛ-/
 橢圓率

From: Webster's Revised Unabridged Dictionary (1913)

 El·lip·tic·i·ty 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.
 ◄ ►

From: WordNet (r) 2.0

 ellipticity
      n : the property possessed by a rounded shape that is flattened
          at the poles; "the oblateness of the planet" [syn: oblateness]