Pronunciation: (spās'tīm'),[key] —n. 1. Also called space'-time' contin"uum. the four-dimensional continuum, having three spatial coordinates and one temporal coordinate, in which all physical quantities may be located.
2. the physical reality that exists within this four-dimensional continuum.
—adj. 1. of, pertaining to, or noting a system with three spatial coordinates and one temporal coordinate.
2. noting, pertaining to, or involving both space and time: a space-time problem.