noun
Refers to a person who is at home in many different countries and cultures, or to something that is international in character. Often used as a noun for a cosmopolitan person, but can also be used adjectivally.
彼は世界中を旅するコスモポリタンだ。
He is a cosmopolitan who travels all over the world.
この街はとてもコスモポリタンな雰囲気がある
This city has a very cosmopolitan atmosphere.