The concept of a fourth dimension is one that is often described in considering its physical implications; that is, we know that in three dimensions, we have dimensions of length (or depth), width, and height. The fourth dimension is orthogonal to the other three spatial dimensions. The cardinal directions in the three known dimensions are called up/down (altitude), north/south (longitude), and east/west (latitude). When speaking of the fourth dimension, an additional pair of terms is needed. Attested terms include ana/kata (sometimes called spissitude or spassitude), vinn/vout (used by Rudy Rucker), and upsilon/delta.

Usually, the fourth dimension is identified with time. In this case, the concept of an additional spatial dimension would be referred to as the fifth dimension.

Concepts

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The Fourth Dimension and Orthogonality

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