Pronunciation: (zär, tsär), [key]
1. an emperor or king.
2. (often cap.) the former emperor of Russia.
3. an autocratic ruler or leader.
4. any person exercising great authority or power in a particular field: a czar of industry. Also,tsar,tzar.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.