The word "universe" in the book is used to denote a number of different scales of organization. A "superuniverse" is roughly the size of a galaxy or group of galaxies, and the seven superuniverses along with Paradise-Havona are together designated as the "grand universe." A "local universe" is a portion of a superuniverse, with 100,000 local universes being in each superuniverse. Beyond the seven superuniverses, uninhabited "outer space levels" are described. The term "master universe" refers to what in modern usage would be the total universe—all existing matter and space taken as a whole.