[pleyn] 
noun, adjective, verb, planed, plan⋅ing.| 1. | a flat or level surface. |
| 2. | Geometry. a surface generated by a straight line moving at a constant velocity with respect to a fixed point. |
| 3. | Fine Arts. an area of a two-dimensional surface having determinate extension and spatial direction or position: oblique plane; horizontal plane. |
| 4. | a level of dignity, character, existence, development, or the like: a high moral plane. |
| 5. | Aeronautics.
|
| 6. | Architecture. a longitudinal section through the axis of a column. |
| 7. | flat or level, as a surface. |
| 8. | of or pertaining to planes or plane figures. |
| 9. | to glide or soar. |
| 10. | (of a boat) to rise partly out of the water when moving at high speed. |
| 11. | Informal. to fly or travel in an airplane: We'll drive to Detroit and plane to Los Angeles. |
plane 1 (plān)
n.
A surface containing all the straight lines that connect any two points on it.
A flat or level surface.
An imaginary surface formed by extension through any axis of the body or through two definite points on the body.
| plane (plān) Pronunciation Key
Noun A two-dimensional surface, any two of whose points can be joined by a straight line that lies entirely in the surface. Adjective Lying in a plane: a plane curve. |