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1. The collection of parallel universes that comprise all of reality in some quantum mechanical and cosmological theories.
2. A similar collection of parallel universes in a work of fiction or a series of related works of fiction.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Astronomy) astronomy the aggregate of all existing matter, of which the universe is but a tiny fragment
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References in periodicals archive ?
And don't even think about touring other universes without packing this book.--Tom Siegfried Knopf, 2011, 372 p., $29.95.
Between us and these other universes lies absolute nothingness, in the exact sense--no space or time, no matter, no energy."
In this theory, our universe emerged from a black hole in a previous universe; moreover, each black hole in our universe (and other universes) generates yet another universe.
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