SSR
n. countablen. Stands for Soviet Socialist Republic. It refers to one of the countries that used to be part of the Soviet Union.
n. Abbreviation for Soviet Socialist Republic. A constituent republic of the former Union of Soviet Socialist Republics (USSR). When used in historical or political contexts, it typically refers to the administrative divisions of the Soviet state.
Ukraine was once an SSR within the Soviet Union.
After the collapse of the central government, each former SSR declared its independence and became a sovereign nation.
The constitutional framework of the Soviet Union theoretically allowed each SSR the right to secede, though in practice, power remained heavily centralized in Moscow until the late twentieth century.
Usually capitalized as an acronym; often preceded by the name of the specific republic.