tyr|an|ny [ˈtırəni] n plural tyrannies [U and C]
[Date: 1300-1400; : Old French; Origin: tyrannie, from Medieval Latin tyrannia, from Latin tyrannus; TYRANT]
1.) cruel or unfair control over other people
Gorky was often the victim of his grandfather's tyranny.
the fight against tyranny
2.) cruel and unfair government
organizations which have criticized the tyrannies of the government
3.) tyranny of the majority
the idea that if everyone has the right to vote, they will make decisions which will harm the country
4.) something in your life that limits your freedom to do things the way you want to
tyranny of
the tyranny of the nine-to-five working day

Dictionary of contemporary English. 2013.