Answer: planar

AnswerCrossword Clue
PLANARFlat
PLANARTwo-dimensional
PLANARFlat, as in geometry
PLANAROf a geometric surface
PLANAROf a flat surface
PLANARLying in a level surface
PLANARFlat; level
PLANARLevel
PLANARLike Flatland
PLANARLess than three-dimensional
planarflat (having a smooth level surface)
planarof or pertaining to a geometric plane
planarflat or level