Meaning

noun a male monarch or emperor (especially of Russia prior to 1917)

noun a person having great power

originEtymology tree Latin Caesarbor. Proto-Germanic *kaisarazder. Proto-Slavic *cěsařь Old East Slavic цѣсарь (cěsarĭ) Old East Slavic цьсарь (cĭsarĭ) Russian царь (carʹ)bor. English czar See tsar. The spelling czar, the older spelling in English, comes from the book Notes on Muscovite Affairs (1549) by Sigismund von Herberstein. It was supplanted by the alternative tsar in the 19th century.

Etymology from Wiktionary, CC BY-SA 3.0