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We found 5 dictionaries that define the word spacetime:

General (4 matching dictionaries)
  1. Spacetime, spacetime: Wordnik
  2. spacetime: Wiktionary
  3. spacetime: Dictionary.com
  4. SpaceTime (software), SpaceTime, Spacetime (Agents of S.H.I.E.L.D.), Spacetime (disambiguation), Spacetime: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Spacetime: Encyclopedia

Definitions from Wiktionary (spacetime)

noun:  (uncountable, physics) The four-dimensional continuum of the three spatial dimensions plus time.
noun:  (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.
noun:  (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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