Meaning

• A level or flat surface.

• A flat surface extending infinitely in all directions (e.g. horizontal or vertical plane).

• A level of existence or development. (eg, astral plane)

• 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.

• (Unicode) Any of a number of designated ranges of sequential code points.

• An imaginary plane which divides the body into two portions.

Meaning

• Of a surface: flat or level.