Page "Marvel Universe" Paragraph 68

Despite various contradictions, the term, dimension is sometimes interchangeable with universe or reality.

Every reality of the Marvel Universe has numerous interconnected dimensions, with each dimension differing from those of other realities ; for example, the Ultimate Asgard has clearly been shown to be distinct from the Asgard known to Earth-616 characters.

Such dimensions, such as Asgard or the Dark Dimension are technically not " pocket dimensions " as they clearly reside completely outside the boundaries of the Marvel Universe, instead of within, as the former does.