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planar

[pley-ner]
adjective
  1. of or relating to a geometric plane.
  2. flat or level.
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Origin of planar

1840–50; < Late Latin plānāris flat, of a level surface, equivalent to Latin plān(um) plane1 + -āris -ar1
Related formspla·nar·i·ty [pluh-nair-i-tee] /pləˈnɛər ɪ ti/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for planarity

planar

adjective
  1. of or relating to a plane
  2. lying in one plane; flat
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Derived Formsplanarity (pleɪˈnærɪtɪ), noun

Word Origin

C19: from Late Latin plānāris on level ground, from Latin plānus flat
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

Word Origin and History for planarity

planar

adj.

1850, from Latin planaris "level, flat," from planum "plane" (see plane (n.1)).

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Online Etymology Dictionary, © 2010 Douglas Harper