Answer: planar

AnswerCrossword Clue
PLANAR

Flat

PLANAR

Two-dimensional

PLANAR

Flat, as in geometry

PLANAR
Of a geometric surface
PLANAR
Of a flat surface
PLANARLying in a level surface
PLANARFlat; level
PLANARLevel
PLANARLike Flatland
PLANARLess than three-dimensional