• synonyms


[ih-lip-tis-i-tee, el-ip-, ee-lip-]
  1. the degree of divergence of an ellipse from a circle.
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Origin of ellipticity

1745–55; elliptic- (see elliptical) + -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ellipticity

Historical Examples

  • The form of our globe, which is that of an oblate spheroid with an ellipticity of about 1⁄299.

    The Sailor's Word-Book

    William Henry Smyth

  • The specific mark of this family is the flattening or ellipticity.

    Darwin and Modern Science

    A.C. Seward and Others

  • Its two diameters are to one another as 17 is to 16; the ellipticity of its disk is manifest to simple inspection.

  • The extensive sets of observations of gravity provided the basis of calculations of the ellipticity of the earth.

  • When these were submitted to calculation, each led to the same value of the ellipticity.

British Dictionary definitions for ellipticity


  1. 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
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012