Multidimensional space

1. Abstract mathematical space considered as a system of elements of any type between which there exist relations similar to those between points in ordinary (two and three) dimensional space.

2. Topological space

3. Non-Euclidian space

4. Pseudo-Euclidian space of four dimensions in which each relativistic 'world' point has a fixed position in space connected with a fixed position in time. Time is the fourth coordinate expressed, in the equation of four coordinate space, with a negative value.

5. The 'ultimate' space of unknown dimensions in which the unification of the four universal physical forces postulated in Unified Field Theory takes place (possible candidates are spaces of five to eleven dimensions).