ecumenopolis · noun1
From ecumene (“inhabited world”) + -polis (“city”). From use as a common noun of Ecumenopolis, applying the concept to diverse scenarios. Ultimately from Ancient Greek.
Ecumenopolis · proper noun2
Coined by Constantinos Apostolou Doxiadis in 1967 from the Ancient Greek words οἰκουμένη (oikouménē, “the world”) + πόλις (pólis, “city”), “a city spanning the whole world”.
Etymology from Wiktionary, CC BY-SA 4.0.