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tsar (n.)

1660s, the more correct Latinization of Russian czar, from prehistoric Slavic *tsesar, from a Germanic source, ultimately from Latin Caesar. See czar. Related: Tsardom; tsarevich; tsarina; tsarevna.

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Definitions of tsar from WordNet

tsar (n.)
a male monarch or emperor (especially of Russia prior to 1917);
Synonyms: czar / tzar
From wordnet.princeton.edu