Wordnet 3.0
NOUN (1)
1.
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;
[syn: Soviet Union, Russia, Union of Soviet Socialist Republics, USSR]
WordNet (r) 3.0 (2006):
Soviet Union
n 1: 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 [syn:
Soviet Union, Russia, Union of Soviet Socialist
Republics, USSR]