Are We Living in a Subuniverse Within a Multiverse?

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Multiverse theory suggests the existence of multiple universes, but the term "universe" traditionally refers to all that exists, leading to the argument for the concept of subuniverses. This perspective posits that our universe could be a subuniverse within a larger framework. Additionally, the cyclic model of the universe proposes that what we perceive as the Big Bang is merely a transition from a previous cycle of contraction and expansion. This idea challenges conventional understandings of time and existence. The discussion highlights the complexity of defining our reality within the broader context of potential multiverses.
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If multiverse theory is true, then there are multiple universes. "Universe" means "all that exists" or "all that there is". So there can't really be multiple "universes"; rather, would it not make better sense to say that there are subuniverses and therefore say that we are in a subuniverse (to be specific)?
 
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Well in a cyclic model, there exists one universe, which undergoes a seemingly infinite number of contractions and bounces, so what we see as a beginning at the big bang was actually preceded by a prior cycle.

http://wwwphy.princeton.edu/~steinh/dm2004.pdf
 

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