A Universe is the collective name for the One Version of Everything.
It is All That Is – the All of Everything.
Everything that there is, is contained within the one version of everything that is our Universe.
A Multiverse is the name given to multiple versions of Reality existing together within the same Time-Space-Continuum.
This creates a paradox & a dilemma.
Therefore: Is our Universe a universe or a multiverse?
Is our Universe one of many or are there many versions of our Universe?
The answer to every question is Yes!
There is by definition only one Universe.
However, there can be a definite number of individual & unique perspectives of that one universe due to the infinite nature of Space and the eternal nature of Time.
Time-Space-Reality is Universal.
Our Universe is a Time-Space-Reality.
Individual perspectives of our time-space-reality are multi-versal.
Multiple perspectives create multiple versions of reality.
A Universal Multiverse is an oxymoron but a Multiversal Universe is a distinct probability.