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As the galaxy is to multiple solar systems, and the universe is to galaxies, the Infiniversal is the collection of infinite amount of universes, anti-universes, everything and nothing and all which they contain. It's rather big.

Used when unsure if the object is the superlative in all possible universes.
that is the biggest *thing* in the infiniversal!

or

Your Mama is the reason they invented the infiniversal!
by Dragazarth April 28, 2011
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