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1D. 2D, 3D

One-dimensional, two-dimensional, three-dimensional. One-dimensional: able to be identified by one co-ordinate, for example points on a line.

Two-dimensional: requiring two co-ordinates for identification, for example points in a plane. Also used to describe flat geometric shapes.

Three-dimensional: requiring three co-ordinates for identification, for example points in space. Also used to describe solid geometric shapes