metaverse

(in science fiction) a shared, realistic, and immersive computer simulation of the real world or other possible worlds, in which people participate as digital avatars.

a theoretical or emergent networked online space with digitally persistent environments that people inhabit, as avatars, for synchronous interactions and experiences, accessing the shared virtual space through virtual reality, augmented reality, game consoles, mobile devices, or conventional computers.

a 3D virtual world, esp in an online role-playing game

the universe as portrayed in a given work of fiction