planenessn.
/ˈpleɪnnəs/, U.S. /ˈpleɪ(n)nəs/ The quality or condition of being plane; flatness, levelness.
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the world > space > shape > flatness or levelness > [noun]
evenlinesseOE
evennesseOE
plainnessc1330
flatnessc1440
level1594
levelness1787
planity1803
planeness1858
planarity1956
1858 Philos. Trans. 1857 (Royal Soc.) 147 626 He describes a practical method of testing the planeness of surfaces.
1896 Jrnl. Geol. (Chicago) 4 955 Overwash plains may sometimes depart from planeness by taking on some measure of undulation.
1935 C. J. Smith Intermediate Physics (ed. 2) v. xlviii. 815 It is a piece of cover glass, selected by optical trial for planeness, and silvered at the back.
1975 D. G. Fink Electronics Engineers' Handbk. ix. 26 Since the periphery of the grid is colder than the center, thermal stresses tend to cause buckling or departure from planeness.
1990 Measurem. Techniques 33 570 The surface retains its planeness within the boundaries of the radiation spot.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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n.1858