Multiverse is always Universe.

Multiverse is always Universe for all is One; a plenum; even beyond the event horizon(s), simply all One. I.e.: Existence is one and this one turns itself into existence in myriad ways (strings and things; all part of One. Any separation or division is illusory for One is all and all exists in this One. One is known by many names (God, Universe, et al) but is existentially One and the same.
~ Wald