The family of cosmopolite and cosmopolitan reaches Greek kosmopolitēs: a world-citizen.
The sources distinguish the adjective and noun histories; this round scores the deeper components rather than a single first-use date.
Sources
- Merriam-Webster: cosmopolitan
Word History directs the reader to cosmopolite.
- Merriam-Webster: cosmopolite
Word History gives the New Latin and Greek formation.
- Merriam-Webster: cosmo-
Combining-form definition and Did You Know explain world and world-citizen.
- Online Etymology Dictionary: politic
Also built on *politēs*: politics, political (Greek politikos "of citizens", from polites "citizen")
- Online Etymology Dictionary · cosmopolitan
Meanings of the older forms on the word path.