plane applies to any real or imaginary flat surface in which a straight line between any two points on it lies wholly within that surface.

PLANE definition: 1. a vehicle designed for air travel, with wings and one or more engines: 2. in mathematics, a…. Learn more.

In geometry, a plane is a flat, two-dimensional surface with an infinite height and width. It’s one of the basic concepts of geometry.Think of a flat sheet of paper.

As a verb, to plane something is to make it flat and smooth. Don't confuse plane with plain, an adjective that means "simple" or a noun that means "flat land," like the plains of the American Midwest.

PLANE meaning: 1 : a vehicle that has wings and an engine and can carry people or things in the air airplane often used before another noun; 2 : a flat or level surface that extends outward like a sheet

1. Mathematics Of or being a figure lying in a plane: a plane curve. 2. Flat; level. See Synonyms at level.

plane /pleɪn/ n a tool with an adjustable sharpened steel blade set obliquely in a wooden or iron body, for levelling or smoothing timber surfaces, cutting mouldings or grooves, etc