planar

[pley-ner]

adjective

of or relating to a geometric plane.
flat or level.

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

of or relating to a plane
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)).