planityn.

Brit.

/ˈplanᵻti/, U.S.

/ˈplænədi/

Forms: 1700s– planity, 1800s– planeity.

Origin: Formed within English, by derivation. Etymons: plane adj., -ity suffix.

Etymology: < plane adj. + -ity suffix. Compare classical Latin plānitās straightforwardness, clarity, a doubtful reading in Tacitus.With form planeity compare -eity suffix.

rare.

Flatness; = planitude n.In quot. 1803 as an equivalent for Welsh nouns apparently coined by the author and supposedly derived from paith (probably in the sense ‘a plain, an open or exposed landscape’).

ΘΚΠ

the world > space > shape > flatness or levelness > [noun]

evenlinesseOE

evennesseOE

plainnessc1330

flatnessc1440

level1594

levelness1787

planity1803

planeness1858

planarity1956

1803 W. O. Pughe Geiriadur Cynmraeg a Saesoneg: Welsh & Eng. Dict. II Peithdra, planity; exposedness... Peithineb, planity.

1876 Proc. Amer. Philos. Soc. 1874–5 14 221 A very short practice affords sufficient skill to grind to a very nearly plane surface. Absolute planeity is not required.

1882 R. A. Proctor Familiar Sci. Stud. 21 The straightness of lines, the planity of surfaces and other like geometrical conceptions.

1932 Proc. Royal Soc. A. 137 155 If the effect of initial departures from planity of the strip be taken into account, the buckling loads determined by experiment are in good agreement with the theoretical values.

1962 Encycl. Dict. Physics II. 179 For surfaces with high quality finish, interferometry bands are used to indicate both straightness in various directions and to provide an over-all depiction of planity.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planity
释义	planityn. Brit. /ˈplanᵻti/, U.S. /ˈplænədi/ Forms: 1700s– planity, 1800s– planeity. Origin: Formed within English, by derivation. Etymons: plane adj., -ity suffix. Etymology: < plane adj. + -ity suffix. Compare classical Latin plānitās straightforwardness, clarity, a doubtful reading in Tacitus.With form planeity compare -eity suffix. rare. Flatness; = planitude n.In quot. 1803 as an equivalent for Welsh nouns apparently coined by the author and supposedly derived from paith (probably in the sense ‘a plain, an open or exposed landscape’). ΘΚΠ the world > space > shape > flatness or levelness > [noun] evenlinesseOE evennesseOE plainnessc1330 flatnessc1440 level1594 levelness1787 planity1803 planeness1858 planarity1956 1803 W. O. Pughe Geiriadur Cynmraeg a Saesoneg: Welsh & Eng. Dict. II Peithdra, planity; exposedness... Peithineb, planity. 1876 Proc. Amer. Philos. Soc. 1874–5 14 221 A very short practice affords sufficient skill to grind to a very nearly plane surface. Absolute planeity is not required. 1882 R. A. Proctor Familiar Sci. Stud. 21 The straightness of lines, the planity of surfaces and other like geometrical conceptions. 1932 Proc. Royal Soc. A. 137 155 If the effect of initial departures from planity of the strip be taken into account, the buckling loads determined by experiment are in good agreement with the theoretical values. 1962 Encycl. Dict. Physics II. 179 For surfaces with high quality finish, interferometry bands are used to indicate both straightness in various directions and to provide an over-all depiction of planity. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1803
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