Omniverse

The Omniverse is the conceptual ensemble of all possible universes, with all possible laws of physics.

This was the idea that, outside our own universe, many other, maybe even endless further universes existed, each made up of different fabric and governed by different laws of time and physics.

Hierarchy within the omniverse
Universe: A Universe, also known as a Cosmos, was a particular individual space-time organization with a cetain number of dimensions specific laws of physics. In our Universe, the fundamental forces in play were the strong force, electromagnetism, the weak force, gravity and the living force. Other Universes may have different kinds of dimensions different laws of physics. It is rumoured there is a universe made entirely of Antimatter.

Multiverse: The Multiverse was a huge grouping with many universes tightly bonded together in "bubbles". The universes within the Multiverses are considered "paralell". The multiverse was also a bubble.

Metaverse: Huge groups of Multiverse bubbles, all within an empty void. Tiny regions of incredible power were contained within these regions. These could explode as "big bangs" to form universes.

Xenoverse: The empty fabric between Metaverses, where regions of Metaverse fabric could slowly develop.

Omniverse: Everything in existence, including the Xenoverse and all Metaverses. Completely infinite, with no laws of physics outside the universes.