Definition of tyrannies:
(n) :
A government in which a single ruler (a tyrant) has absolute power, or this system of government; especially, one that acts cruelly and unjustly.
(n) :
Absolute power, or its use.
(n) :
The office or jurisdiction of an absolute ruler.
(n) :
A system of government in which power is exercised on behalf of the ruler or ruling class, without regard to the wishes of the governed.
(n) :
Extreme severity or rigour.