WordReference Random House Unabridged Dictionary of American English © 2026
Fourth′ Interna′tional, 
  1. Governmenta loose federation of small groups of radical socialists formed in 1936 under the leadership of Leon Trotsky and hostile to the Soviet Union. Cf. international (def. 6).

'Fourth International' also found in these entries (note: many are not synonyms or translations):
Trotskyist International - international

Forum discussions with the word(s) "Fourth International" in the title:


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