noun
- an emperor: title of any of the former emperors of Russia and, at various times, the sovereigns of other Slavic nations
- ☆ any person having great or unlimited power; autocrat: the President's energy czar
Origin:
Russ tsar', contr. of tsesar < OSlav cēsarĭ; prob. via Goth kaisar < L Caesar: see (Gaius) Julius Caesar