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Definition of Alternate universe
1. Noun. (physics cosmology) A hypothetical world situated in a different dimension of space and time than the real world consisting of the universe known and experienced by human beings. ¹
2. Noun. (literature narratology) An imaginary realm, often a variant form of the real world, depicting a different way events could have unfolded or the universe could have functioned. ¹
¹ Source: wiktionary.com