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USSR

also U.S.S.R., initialism (acronym) of Union of Soviet Socialist Republics, by 1926.

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Definitions of USSR from WordNet

ussr (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: Soviet Union / Russia / Union of Soviet Socialist Republics
From wordnet.princeton.edu