supercivilization

noun

su·​per·​civ·​i·​li·​za·​tion ˌsü-pər-ˌsi-və-lə-ˈzā-shən 

plural supercivilizations

: a highly developed civilization : a society that has advanced to a very high level of cultural or technological development

After a claimed UFO encounter at White Sands, New Mexico, … [Daniel] Fry founded Understanding, Inc. His contacts professed to be the remnants of a past supercivilization on earth that had destroyed itself through war, and they did not want that disaster repeated.

—Robert S. Ellwood and Gregory D. Alles

Word History

First Known Use

1801, in the meaning defined above