In art, the imaginary plane correspondent with the physical surface of a drawing, painting or print.

a hand plane designed for cutting rebates in wood

(geometry) The set of all points in a planar coordinate system.

A rebate plane.

(mathematics) the locus of points in the Euclidean plane that satisfies some geometric or algebraic definition; a curve in a plane (as opposed to higher-dimensional space)

(mathematics) Two-dimensional Euclidean space.

(mathematics) a representation of the space of complex numbers

(parapsychology, Theosophy) A supernatural plane of existence, propounded by esoteric philosophies, some religious teachings, and New Age thought.

A two-dimensional plane (or other surface) of weakness along which a crystal or other solid will break when under stress.

(geology) A plane of separation between rock masses.