Plane
in joinery, a carpenter's cutting and surface smoothing tool, of which there are many varieties, named from some peculiarity of construction or purpose.
In geometry, a surface such that, if any two points be taken at pleasure and joined by a straight line, that line will In geometry, a surface such that, if joined by a straight line, that line will lie wholly in the surface. A plane is supposed to extend indefinitely in all directions, the term is also frequently used, especially in astronomy, to denote an ideal surface supposed to cut or pass through a solid body, or in various directions; as, the plane of the ecliptic, the plane of a planet's orbit.
PLANE TREE