post-Soviet UK /ˌpəʊstˈsəʊvi.ət/US /ˌpoʊstˈsoʊvi.ət/ adjective3 •After the dissolution of the Soviet Union.Her sole previous experience of the Soviet, or post-Soviet, had been a single evening in the former East Berlin, a few months after the Wall’s fall. — 2003 •Relating to the countries which emerged from the dissolution of the Soviet Union, especially in the context of Russia.Post-Soviet relations with the West can vary enormously. •(old-fashioned, rare) After the formation of the Soviet Union.