1
: emperor
specifically
: the ruler of Russia until the 1917 revolution
2
: one having great power or authority
a banking czar
variants
or less commonly tsardom
plural -s
1
: the territory ruled by a czar
the czardom of Moscow … became aware of itself as the heir of Constantinople—
R. M. French
2
: the office or authority of a czar
the memorable revolt … against the czardom of Speaker Cannon—
Allan Nevins
Love words? Need even more definitions?
Merriam-Webster unabridged



