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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.
(in cosmology) a hypothetical universe that coexists with our known universe but may operate under fundamentally different laws of physics.
. (in science fiction, fantasy, etc.) a separate universe or world that coexists with our known universe but is very different from it.
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.
Based on the Random House Dictionary, © Random House, Inc. 2014.
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