the theoretical concept that multiple universes exist beyond our own, possibly infinite parallel realities.
Modern compound from 'multi-' (many) plus 'verse' (universe, from Latin 'versus' meaning turned). Coined in science fiction and adopted by theoretical physics in the late 20th century.
The multiverse isn't just science fiction—serious physicists think it's likely real because quantum mechanics and cosmic inflation math point to it, meaning there could be infinite copies of you making different choices in other dimensions.
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