one-worlder

[ wuhn-wurl-der ]

noun

1. a person who supports or believes in any of various movements to establish a world government or a federation of nations stronger than any individual nation, for the purpose of promoting the common good.
2. a person who believes in the possibility of peaceful cooperation among nations.

Word History and Origins

Origin of one-worlder¹

1945–50; one world + -er ¹