- the four-dimensional continuum, having three spatial coordinates and one temporal coordinate, in which all physical quantities may be located.
- the physical reality that exists within this four-dimensional continuum.
- of, relating to, or noting a system with three spatial coordinates and one temporal coordinate.
- noting, pertaining to, or involving both space and time: a space-time problem.
- the four-dimensional continuum having three spatial coordinates and one time coordinate that together completely specify the location of a particle or an event
