multiverse

Pronunciation: /ˈmʌltɪˌvɜːs/

The English word “multiverse” has 3 meanings listed here.

noun

The world, considered as lacking in purpose, design, or predictability.
The hypothetical group of all the possible universes in existence.
The different canons, continuities or timelines of a fictional property, considered as a whole.

First appeared c. 1895. Blend of multiple + universe, coined by American philosopher William James. By surface analysis, multi- + -verse.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.