First reliably attested in 1974: either ecumenopolis + -itan, as Ecumenopolitan, or a generalised use thereof, parallel with the development of ecumenopolis.
"ecumenopolitan." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/ecumenopolitan>.
ecumenopolitan. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/ecumenopolitan
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