A lot vs. Alot: 9 Grammatical Pitfalls
1844, from cosmopolite "citizen of the world" (q.v.) on model of metropolitan. The U.S. women's magazine of the same name was first published in 1886. Cosmopolitanism first recorded 1828.
cosmopolitan cos·mo·pol·i·tan (kŏz'mə-pŏl'ĭ-tn)adj. Growing or occurring in many parts of the world; widely distributed. n. A cosmopolitan organism.