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A Plane

  1. A level or flat surface.
  2. (geometry) A flat surface extending infinitely in all directions (e.g. horizontal or vertical plane).

1. (anatomy) An imaginary plane which divides

  1. the body into two portions.
  2. A level of existence or development.
  3. A roughly flat, thin, often moveable structure used to create lateral force by the flow of air or water over its surface, found on aircraft, submarines, etc. (Compare wing, airfoil, hydrofoil.)
  4. (computing, Unicode) Any of 17 designated ranges of 216 (65,536) sequential code points each.
  5. (countable, carpentry) A tool for smoothing wood by removing thin layers from the surface. (مسحاج)

Astrophysics:

The plane of the sky is defined to be perpendicular to the line of sight.