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See more synonyms for one-worlder on Thesaurus.com
  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.
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Origin of one-worlder

1945–50; one world + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018