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tsar

noun [C] (RULER) (also tzar, US usually czar)
 
 
/zɑːr/ US  /zɑːr/

Definition

(until 1917) the male Russian ruler: Tsar Nicholas IRoyalty, aristocracy and titles tsarist (also tzarist, US usually czarist)
 
 
/ˈzɑː.rɪst/ US  /ˈzɑːr.ɪst/ adjective, noun [C]
the tsarist empire Tsarist RussiaSystems of government
(Definition of tsar noun (RULER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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