(formerly) another name for Russian Soviet Federative Socialist Republic, Soviet Union
Russian Soviet Federative Socialist Republic in British English
noun
(formerly) the largest administrative division of the Soviet Union
Abbreviation: RSFSR
Soviet Union in British English
noun
a former federal republic in E Europe and central and N Asia: the revolution of 1917 achieved the overthrow of the Russian monarchy and the Soviet Union (the USSR) was established in 1922 as a Communist state. It was the largest country in the world, occupying a seventh of the total land surface. The collapse of Communist rule in 1991 was followed by declarations of independence by the constituent republics and the consequent break-up of the Soviet Union
Official name: Union of Soviet Socialist Republics. Also called: Russia, Soviet Russia. Abbreviation: USSR