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
» Maths Terms for 11-13 Yr Olds