Jisho

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Noun
1. level surface; plane
Wikipedia definition
2. Plane (geometry)In mathematics, a plane is a flat, two-dimensional surface. A plane is the two dimensional analogue of a point (zero-dimensions), a line (one-dimension) and a space (three-dimensions). Planes can arise as subspaces of some higher dimensional space, as with the walls of a room, or they may enjoy an independent existence in their own right, as in the setting of Euclidean geometry.
Read “Plane (geometry)” on English Wikipedia
Read “平面” on Japanese Wikipedia
Read “Plane (geometry)” on DBpedia

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