chiliocosm means A collection of many worlds. Lexicurio rates it Sui generis — a strength score of 91 out of 100.
Why “chiliocosm” is a great word
CHILIOCOSM — [Noun] In Buddhist cosmology, a specific, hierarchical unit comprising one thousand distinct world-systems. From the combining form chilia- (from Ancient Greek χίλιοι (chílioi, "thousand")) + Ancient Greek κόσμος (kósmos, "world, order"). First attested in English in 1848 in the translation of Faxian's pilgrimage. Unlike "cosmos," which suggests a single, ordered universe, or "multiverse," which implies a modern, speculative plurality, a chiliocosm is a vast but precisely enumerated architectural tier of reality. It is one thousand Mount Merus ringed by concentric seas, one thousand sets of suns and moons tracing their arcs, one thousand realms stacked like luminous nesting boxes—a numerical sublime that renders the infinite comprehensible through finite, manageable parcels.
Etymology
From chilia- + Ancient Greek κόσμος (kósmos, “world”).
noun
- A collection of many worlds.“It is he who in the Fa houa king is called the Lord of the Savaloka, the great Brahma, who governs the grand chiliocosm, that is the greatest of the three aggregations of universes, containing a thousand million of suns, of Sumerus, and quadruple continents such as we behold.”