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 Plane:  One of the basic undefined terms of geometry. A plane goes on forever in all directions (in two-dimensions) and is "flat" (i.e., it has no thickness).

Planes at Mathforum.com: Read another description of plane.

Basic Terms at Thinkquest.org: Read more about the basic meanings of the Geometry words: equidistant, points, line, plane, collinear, coplanar, intersection, and angles.

Points, Lines and Planes: Read more about points, lines and planes.