tyr·an·ny noun \ˈtir-ə-nē\
1: oppressive power ; especially : oppressive power exerted by government
2: a: a government in which absolute power is vested in a single ruler; especially : one characteristic of an ancient Greek city-state
b : the office, authority, and administration of a tyrant
3: a rigorous condition imposed by some outside agency or force
4: an oppressive, harsh, or unjust act : a tyrannical act