| n. | 1. | the four-dimensional coordinate system in which all physical objects of the known universe are located, and in which all physical events occur; it consists of three spatial dimensions and one time dimension; - also called the |
| Noun | 1. | space-time - the 4-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located Synonyms: space-time continuum |