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Synonyms
pla·nar (plā́nər, -näŕ)

[Late Latin plānāris, flat, from Latin plānus; see plain.]

adjective 

  1. Of, relating to, or situated in a plane.
  2. Flat: a planar surface.
  3. Having a two-dimensional characteristic.

derivatives

pla·naŕi·ty
noun