soviet union is a noun meaning "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". It carries one recorded sense.
Definitions, synonyms and semantic relations for soviet union come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.