A state or a place that is not located in our 3 dimensional plane and/or can't be precieved normally with our 5 senses.

Usually defined as an other vibration frequency of the universe that can be explored, similar to a radio or tv channel that you can tap into with meditation, psychedelics.

When our mortal body dies and our spirit is untattered from our flesh and bones now has the the possibility for navigating other realms of our infinite universe.

Literally everyone, ever. Including the writer of this definition.