Definition Of Dimension - Math Is Fun

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Mathematics: A direction in space that can be measured, like length, width, or height.

Examples: • a point has no dimension • a line has one dimension (1D) • a square has two dimensions (2D) • a cube has three dimensions (3D)

Physics: any measurable quantity such as length, time, mass, and so on. Time is often called the fourth dimension (combined with 3 space dimensions).