informal name of the Union of Soviet Socialist Republics; in use in U.S. newspapers by October 1919.
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Definitions of Soviet Union from WordNet
Soviet Union (n.)
a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991;
Synonyms: Russia / Union of Soviet Socialist Republics / ussr