In my own mind the multiverse could consist of either multiple universes occupying the same "space" (as in different dimensions) and/or different areas of space where what we consider to be our own universe is only one "bubble", outside of which are an infinite number of other bubbles, possibly created by their own Big Bangs.
The first variant above is what I would refer to as parallel universes, i.e. not the "bubbles". Or to put it another way, The different universe instances in the multiverse could be parallel.
Note that my understanding of current hypothesis and theories in this area is very limited. These are just my own thoughts.
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