multiverse

[ muhl-ti-vurs ]
/ ˈmʌl tɪˌvɜrs /

noun

(in physics and cosmology) a hypothetical collection of identical or diverse universes, including our own.

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Origin of multiverse

First recorded in 1895–1900; multi- + (uni)verse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for multiverse

multiverse
/ (ˈmʌltɪˌvɜːs) /

noun

astronomy the aggregate of all existing matter, of which the universe is but a tiny fragment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012