Union of Soviet Socialist Republics Hear it!

Union of Soviet Socialist Republics Definition

Union of Soviet Socialist Republics

former country in E Europe & N Asia, extending from the Arctic Ocean to the Black Sea & from the Baltic Sea to the Pacific: formed in 1922 as a union of fifteen constituent republics, it was disbanded in 1991: 8,649,000 sq mi (22,401,000 sq km); cap. Moscow