UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈpleɪnə/US:USA pronunciation: respellingUSA pronunciation: respelling(plānər)

WordReference Random House Unabridged Dictionary of American English © 2020
pla•nar  (plānər),USA pronunciation adj. 
  1. Mathematicsof or pertaining to a geometric plane.
  2. flat or level.
pla•nar•i•ty  (plānər),USA pronunciation n. 
  • Late Latin plānāris flat, of a level surface, equivalent. to Latin plān(um) plane1 + -āris -ar1
  • 1840–50;

Collins Concise English Dictionary © HarperCollins Publishers::
planar /ˈpleɪnə/ adj
  1. of or relating to a plane
  2. lying in one plane; flat
Etymology: 19th Century: from Late Latin plānāris on level ground, from Latin plānus flat
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