Dimension

A dimension is a manner in which that which always stands beyond expression comes to expression.

People usually speak of three dimensions (height, width, and depth) and may additionally append a fourth (time).

In reality, the three spatial dimensions are not dimensions at all. Extensionality itself can be spoke of as a dimension in certain situations, but in the average experience of most people, the so-called domain known as "space" is a manner in which other dimensions (generally time) are experienced.