**Dimensions**

On the most basic level, this term refers to the measurements describing the size of an object. For example, length and width are the dimensions of a rectangle.

In a more advanced sense, the number of dimensions a set, region, object, or space possesses indicates how many mutually perpendicular directions of movement are possible. For example, a line is one dimensional, a plane is two dimensional, the space in which we live is three dimensional, and a point is zero dimensional.

**See also**

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