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Metagalaxy is a term referring to a large-scale galactic system. It may refer to

• The whole Observable Universe
• A galactic group or cluster
• A group of clusters, such as a supercluster
• The entire system of galaxies making up the large-scale structure of the universe
• Multiple virtual worlds clustered together as perceived collectives under a single authority

This term is now little used. Historically, it was first referred to the entire observable Universe as an extension of something larger than a galaxy, i.e. the whole observable Universe.

• Disambiguation pages