A Multiverse is the concept that there are more than one Universes. An Omniverse is a set of all Universes. Thus, the Omniverse may only include our Universe, or if there is indeed a Multiverse, it would include those as well.

Roughly speaking the universe is “all that there is”. A dimension has nothing whatsoever to do with that: it’s (equally roughly) a “measure of extent”. Length is a dimension. As is height/width/time (temporal extent).

The Omniverse exists in the surrounding emptiness known as The Outside, a void of virtual nothingness. Whatever may lie outside of these concepts is simply referred to as Beyond, one of the many iterations contained by Transcendentem.

The existence of a multiverse suggests infinite universes. Since infinity doesn’t end, neither will the number of universes, and neither will the number of multiverses. Therefore, beyond our universe, is another. And beyond that, another, and so on until infinityy.

A Hyperverse is a collection of Xenoverses, randomly scattered around, except if the Xenoverse is unable to assume a random position in space and is dependant upon another Xenoverse or else.

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Complex Multiversal is supposed to be one level above a Multiversal entity. A Multiversal entity can affect/destroy a multiverse, i.e. a discrete group of connected universes. Complex Multiversal characters can do shenanigans with infinities and extra dimensions. Outerversal = realms completely beyond the multiverse.

megaverse = more then one multiverse, possibly infinite number of multiverses. Omniverse = every single universe, so every piece of fiction, infinite number of megaverses.