of or relating to a geometric plane.
flat or level.
Origin of planar
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
of or relating to a plane
lying in one plane; flat
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
1850, from Latin planaris "level, flat," from planum "plane" (see plane (n.1)).
Online Etymology Dictionary, © 2010 Douglas Harper