Princeton's WordNet

1. dictatorship, absolutism, authoritarianism, Caesarism, despotism, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny(noun)

   a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)

2. absolutism, tyranny, despotism(noun)

   dominance through threat of punishment and violence

Wiktionary

1. tyranny(Noun)

   A government in which a single ruler (a tyrant) has absolute power.

2. tyranny(Noun)

   The office or jurisdiction of an absolute ruler.

3. tyranny(Noun)

   Absolute power, or its use.

4. tyranny(Noun)

   Extreme severity or rigour.

Webster Dictionary

1. Tyranny(noun)

   the government or authority of a tyrant; a country governed by an absolute ruler; hence, arbitrary or despotic exercise of power; exercise of power over subjects and others with a rigor not authorized by law or justice, or not requisite for the purposes of government

2. Tyranny(noun)

   cruel government or discipline; as, the tyranny of a schoolmaster

3. Tyranny(noun)

   severity; rigor; inclemency

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