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spacetime noun

  /ˈspeɪsˌtaɪm/
  • (uncountable, physics) The four-dimensional continuum of the three spatial dimensions plus time.
  • (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.
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