RhymeZone: oprichnina definitions

Definitions of oprichnina:

noun: (historical) The period of Russian history between 1565 and 1572 during which Tsar Ivan the Terrible instituted a domestic policy of secret police, mass repressions, public executions, and confiscation of land from Russian aristocrats.
noun: (historical) This domestic policy.

(Definitions from Wiktionary)