Three-dimensional space

Three-dimensional space is a mathematical space in which three values (coordinates) are required to determine the position of a point. It is a geometric three-parameter model of the physical universe (without considering time) in which all known matter exists. These three dimensions can be labeled by a combination of three chosen from the terms length, width, height, depth, and breadth. Any three directions can be chosen, provided that they do not all lie in the same plane.

Quotes

 * Motion in three dimensions is not easy to understand. For example, you are probably good at driving a car along a freeway (one-dimensional motion) but would probably have a difficult time in landing an airplane on a runway (three dimensional motion) without a lot of training.
 * Jearl Walker, David Halliday, and Robert Resnick, Fundamentals of Physics (10th ed., 2014), Ch. 4. Motion in Two and Three Dimensions