noun, plural tyrannies.
arbitrary or unrestrained exercise of power; despotic abuse of authority. despotism, absolutism, dictatorship.
the government or rule of a tyrant or absolute ruler.
a state ruled by a tyrant or absolute ruler.
oppressive or unjustly severe government on the part of any ruler.
undue severity or harshness.
a cruel or harsh act or proceeding; an arbitrary, oppressive, or tyrannical action.

1325–75; Middle English tyrannie < Old French < Medieval Latin tyrannia, equivalent to Latin tyrann(us) tyrant + -ia -y3

pretyranny, noun, plural pretyrannies.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tyranny (ˈtɪrənɪ)
n , pl -nies
1.  a.  government by a tyrant or tyrants; despotism
 b.  similarly oppressive and unjust government by more than one person
2.  arbitrary, unreasonable, or despotic behaviour or use of authority: the teacher's tyranny
3.  any harsh discipline or oppression: the tyranny of the clock
4.  a political unit ruled by a tyrant
5.  (esp in ancient Greece) government by a usurper
6.  a tyrannical act
[C14: from Old French tyrannie, from Medieval Latin tyrannia, from Latin tyrannustyrant]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1368, "cruel or unjust use of power," from O.Fr. tyrannie (13c.), from L.L. tyrannia "tyranny," from Gk. tyrannia "rule of a tyrant," from tyrannos "master" (see tyrant). Tyrannize is first attested 1494, from M.Fr. tyranniser (14c.); tyrannical was formed 1538 (tyrannic
was used in this sense from 1491).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But even that may not be enough to free us from the tyranny of capped data
  consumption and gaping holes in its coverage.
Even absolute autocrats attempt to justify their tyranny through propaganda and
Those who would use science to justify tyranny are not promoting respect for
Tyranny today no longer requires armed intimidation.
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