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What does spacetime mean?

Looking for the meaning or definition of the word spacetime? Here's what it means.

Noun
  1. (physics) The four-dimensional continuum of the three spatial dimensions plus time.
  2. (physics) An n-dimensional continuum consisting of dimensions of both space and time. Normally spacetime is considered as having 4 dimensions (x, y, z, t), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory.
  3. (relativity) A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.
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Examples
Establishment of spacetime boxes in areas where juveniles or spawners are abundant, especially for vulnerable or threatened species.
The photons that reached its senses followed paths that varied slightly from the straight-line geodesics of flat spacetime.
Its chosen scientific focus, quantum theory and spacetime, is very close to my heart.
The time line dips back into the past and could form a closed curve in spacetime.
In Newtonian spacetime it may appear implausible, but it may fare better when we turn to Minkowski spacetime.
Gis the Einstein tensor in curved spacetime and T is an unknown tensor with mixed symmetry which is actually specified by that vertical bar.

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