Entry 1 sense Webster, 1913 Cosmopolitanism /(k?z`m?-p?l"?-tan-?z'm)/ · Cos·mo·pol·i·tan·ism · IPA /ˌkɑzməˈpɑlɪtənɪzm̩/ 01 n. The quality of being cosmopolitan; cosmopolitism. 1. The quality of being cosmopolitan; cosmopolitism.