planar

Definition

Of or pertaining to a plane.

Etymology

From Late Latin plānārius (“relating to a plane”), derived from Latin plānus (“flat”, “level”), equivalent to plane + -ar, ultimately from Proto-Indo-European *pleh₂- (“flat”).

Example Sentences

• "A planar projection of a three-dimensional object is its projection onto a plane."
• "A complete graph with more than four nodes is never planar."

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