multiverse

/M AH1 L T AH0 V ER1 S/
noun
  1. 1

    The world, considered as lacking in purpose, design, or predictability.

  2. 2

    The hypothetical group of all the possible universes in existence.

    โ€œIn the DC multiverse, our reality is called "Earth-33". But in the Marvel multiverse, it's "Earth-1218".โ€

Source: https://en.wiktionary.org/wiki/multiverse