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countable and uncountable, plural Russias
The largest country in the world, a transcontinental country in Eastern Europe and North Asia. Official name: Russian Federation. Capital and largest city: Moscow. It borders the Pacific and Arctic Oceans and the Baltic, Black, and Caspian Seas. Part of the Soviet Union from 1917 through 1991. examples
(historical, loosely) The Union of Soviet Socialist Republics (a very common name, although more formally Russia, the RSFSR, was one of several constituent republics of the USSR).
(historical) The Russian Empire; the tsarist empire in Russia lasting from 1721 to 1917. quotations
Ukraine (“frontier”), the name formerly given to a district of European Russia, now comprising the governments of Kharkov, Kiev, Podolia and Poltava.
1911, “Ukraine”, in 1911 Encyclopædia Britannica
(historical, dated) Kievan Rus; the medieval East Slavic state centered in Kiev. quotations
(dated, countable) Any of several East Slavic states descended from Kievan Rus, typically including Russia (Great Russia), Belarus (White Russia) and Ukraine (Little Russia). quotations examples
Or rather if I be attaining a better autocratship than that of the Emperor of all the Russias — the empire over self.
1842, George Eliot, Selections from George Eliot's letters, Letter to Cara Bray, page 24
Then there is White Russia and Red Russia, Great Russia and Little Russia, Russia of the Frozen North and Russia of the Far East — a Russia equally dangerous to every one of her neighbours […]
1914, Russia and the Russian People
Short for Russia leather. quotations examples
Dull Russias will prove a good selling line for women according to the predictions of certain manufacturers.
1914, Shoe and Leather Journal, volume 27, page 36