Can you please clarify what Marvel's current stance is regarding the term "omniverse"? According to Mark Gruenwald's original definition, and the official handbooks, it is all of fiction and reality combined. However, going by recent comicbooks by Al Ewing, it seems to be something less, as it is possible to journey outside of it. Thanks in advance for any help.

No matter how you might choose to define “everything”, it’s always going to be possible to go outside it. Kind of like trying to determine an infinite number–there’s always going to be a bigger number no matter what you do.