des·pot·ism 
(dĕspə-tĭz′əm)
(dĕspə-tĭz′əm)n.
1. Rule by or as if by a despot; absolute power or authority.
2. The actions of a despot; tyranny.
3.
a. A government or political system in which the ruler exercises absolute power.
b. A state so ruled.