Of a surface: flat or level.

A level or flat surface. / (geometry) A flat surface extending infinitely in all directions (e.g. horizontal or vertical plane). / (anatomy) An imaginary plane which divides the body into two portions.

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

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

An airplane; an aeroplane. / (entomology) Any of various nymphalid butterflies, of various genera, having a slow gliding flight.

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

(countable) A deciduous tree of the genus Platanus. / (Northern UK) A sycamore.

plural of plane

Third-person singular simple present indicative form of plane

simple past tense and past participle of plane