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multiverse

[ muhl-ti-vurs ]
/ ˈmʌl tɪˌvɜrs /
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noun

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

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Origin of multiverse

Coined by William James in 1895 in the sense “the universe imagined as lacking order, unity, or a single ruling and guiding power”; multi- + (uni)verse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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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

Scientific definitions for multiverse

multiverse
[ mŭltə-vûrs′ ]

The collection of parallel universes that comprise all of reality in some quantum mechanical and cosmological theories.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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