Webster's English Dictionary

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tyrant

ty.rant \'ti--r*nt\ n [ME tirant, fr. OF tyran, tyrant, fr. L tyrannus, fr. 
   G]k tyrannos 1: an absolute ruler unrestrained by law or constitution : a 
   usurper of s overeignty 2a: a ruler who exercises absolute power 
   oppressively or brutally  2b: one resembling such a tyrant in the harsh use 
   of authority or power