multiverse

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mul·ti·verse

 (mŭl′tə-vûrs′)
n.
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.

multiverse

(ˈmʌltɪˌvɜːs)
n
(Astronomy) astronomy the aggregate of all existing matter, of which the universe is but a tiny fragment
Translations
Multiversum