ellipticityn.

/ɛlɪpˈtɪsɪti/

Etymology: < elliptic adj. + -ity suffix.

a. Elliptic form; degree of deviation (of an orbit, etc.) from circularity, (of a spheroid) from sphericity.

ΘΚΠ

the world > space > shape > curvature > roundness > [noun] > oval or elliptical quality

ovality1687

ovalness1727

ellipticity1754

1754 Philos. Trans. 1753 (Royal Soc.) 48 84 [In] the case of beds supposed of the same ellipticity..I have taken greater care.

1833 J. F. W. Herschel Astronomy iii. 109 Its deviation from the circular form, arising from so very slight an ellipticity.

1864 Athenæum No. 1926. 402/2 The ellipticity of Mars.

1870 W. S. Jevons Elem. Lessons Logic (1880) xxxiii. 291 An orbit of slight ellipticity.

b. as a measurable quantity.The ellipticity of a spheroid (e.g. of the figure of a planet) is expressed by some mathematicians as the ratio of the difference of the axes to the major axis, and by others as the ratio of this difference to the minor axis. (With reference to orbits this mode of expressing ellipticity is not used; see eccentricity n. 3b.)

ΚΠ

1754 Philos. Trans. 1753 (Royal Soc.) 48 77 The diminution of the gravity having been found greater than ¹/ ₂₃₀, the ellipticity or difference of diameters ought to be less than that fraction.

1855 D. Brewster Mem. Life I. Newton (new ed.) I. xiii. 361 The ellipticity of the earth..has been found to be ¹/ ₂₉₉.

1867 E. B. Denison Astron. without Math. (ed. 3) 7 Its ellipticity..means the proportion between the difference of the two axes..of an ellipse, and the greater of them.

This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2018).

单词	ellipticity
释义	ellipticityn. /ɛlɪpˈtɪsɪti/ Etymology: < elliptic adj. + -ity suffix. a. Elliptic form; degree of deviation (of an orbit, etc.) from circularity, (of a spheroid) from sphericity. ΘΚΠ the world > space > shape > curvature > roundness > [noun] > oval or elliptical quality ovality1687 ovalness1727 ellipticity1754 1754 Philos. Trans. 1753 (Royal Soc.) 48 84 [In] the case of beds supposed of the same ellipticity..I have taken greater care. 1833 J. F. W. Herschel Astronomy iii. 109 Its deviation from the circular form, arising from so very slight an ellipticity. 1864 Athenæum No. 1926. 402/2 The ellipticity of Mars. 1870 W. S. Jevons Elem. Lessons Logic (1880) xxxiii. 291 An orbit of slight ellipticity. b. as a measurable quantity.The ellipticity of a spheroid (e.g. of the figure of a planet) is expressed by some mathematicians as the ratio of the difference of the axes to the major axis, and by others as the ratio of this difference to the minor axis. (With reference to orbits this mode of expressing ellipticity is not used; see eccentricity n. 3b.) ΚΠ 1754 Philos. Trans. 1753 (Royal Soc.) 48 77 The diminution of the gravity having been found greater than ¹/ ₂₃₀, the ellipticity or difference of diameters ought to be less than that fraction. 1855 D. Brewster Mem. Life I. Newton (new ed.) I. xiii. 361 The ellipticity of the earth..has been found to be ¹/ ₂₉₉. 1867 E. B. Denison Astron. without Math. (ed. 3) 7 Its ellipticity..means the proportion between the difference of the two axes..of an ellipse, and the greater of them. This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2018). < n.1754
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