So, the definition of a monoverse is a universe which has only one timeline. This essentially means that it is not quantum. In general, a monoverse is unlikely to have any parallel worlds, however this isn't necessarily the case. Sometimes, despite a lack of quantum mechanics, parallel timelines may form through extreme events.

When a set of monoverses shares an origin, or perhaps a metalayer, this results in an Omniverse instead of a Multiverse. An omniverse is different by a matter of magnitude. There is not the same level of proximity between parallel worlds as in quantum universes.