chiliocosm
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.
Where it comes from
From chilia- + Ancient Greek κόσμος (kósmos, “world”).
Adapted from the Wiktionary entry chiliocosm (CC BY-SA 4.0).