
The fourdimensional continuum of the three spatial dimensions plus time.
(noun)

An ndimensional continuum consisting of dimensions of both space & time. Normally spacetime is considered as having 4 dimensions (x, y, z, t), but higherdimensional spacetimes are often encountered in theoretical physics, e.g. the 5dimensional spacetime of KaluzaKlein theory or the 11 dimensions of spacetime in Mtheory.
(noun)

A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.
(noun)
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