= planimetric, adj.

Geometry. Of a surface: perfectly flat or level, without curvature, so that every straight line joining any two points of the surface lies wholly…

= planar, adj. 1.

Of or relating to planimetry or plane geometry; relating to or existing in two dimensions, planometric; (Physical Geography and Cartography)…

Of or relating to a plane; (having parts) situated in or forming a plane or (esp. parallel) planes; flat, two-dimensional.

Of or relating to representation in a plane; two-dimensional. Cf. planimetric, adj.