Wikipedia: Space

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In physics, space is defined as a coordinate?s system where you can locate an object. In classical physics the space is a three coordinates euclidean? system (x,y,z). In relativistic physics the space is defined as a four coordinates system (x,y,z,t). The fourth coordinate is time.

In physics, space is defined as a [coordinate system]? where you can locate an object. In classical physics the space is a three-coordinate euclidean? system (x,y,z). In relativistic physics, one talks about spacetime rather than about space; spacetime is modeled as a four-dimensional manifold.