1A medieval principality in west central Russia, centered around Moscow, that formed the nucleus of modern Russia. As Muscovy expanded, princes of Muscovy became the rulers of Russia; in 1472 Ivan III, grand duke of Muscovy, completed the unification of the country, and in 1547 Ivan the Terrible became the first tsar of Russia.
From obsolete French Muscovie, from modern Latin Moscovia, from Russian Moskva 'Moscow'.
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