planar

[pley-ner]

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
Derived Formsplanarity (pleɪˈnærɪtɪ), noun

Word Origin for planar

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)).

Online Etymology Dictionary, © 2010 Douglas Harper