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parallel universe

noun
1.
Physics. any of a hypothetical collection of undetectable universes that are like our known universe but have branched off from our universe due to a quantum-level event.
See also multiverse.
2.
(in cosmology) a hypothetical universe that coexists with our known universe but may operate under fundamentally different laws of physics.
See also multiverse.
3.
Also called alternative universe. (in science fiction, fantasy, etc.) a separate universe or world that coexists with our known universe but is very different from it.
4.
a realm of existence and experience that is fundamentally different from the one that most humans share; a separate reality:
I don’t understand him—I think he lives in a parallel universe.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for parallel universe
Contemporary Examples
Historical Examples
  • "It's the parallel universe business, of course," he said to Pete, with Tommy beaming over his shoulder.

    PRoblem Alan Edward Nourse
Contemporary definitions for parallel universe
adjective

composed of some but not all members descending from a common ancestor

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