A level or flat surface.

(geometry) A flat surface extending infinitely in all directions or an imaginary plane that divides the body into two portions.

A level of existence or development.

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.)

(computing, Unicode) Any of 17 designated ranges of 216 (65,536) sequential code points each.

(countable, carpentry) A tool for smoothing wood by removing thin layers from the surface.

An airplane; an aeroplane.

(entomology) Any of various nymphalid butterflies, of various genera, having a slow gliding flight.

(entomology) The butterfly Bindahara phocides, family Lycaenidae, of Asia and Australasia.

(countable) A deciduous tree of the genus Platanus.

(Northern UK) A sycamore.

(transitive, carpentry) To smooth (wood) with a plane.

(nautical, of a boat) To move in a way that lifts the bow out of the water.

To glide or soar.

Of a surface: flat or level.