tyranny (n.)youdaoicibaDictYouDict[tyranny 词源字典]
late 14c., "cruel or unjust use of power; the government of a tyrant," from Old French tyranie (13c.), from Late Latin tyrannia "tyranny," from Greek tyrannia "rule of a tyrant, absolute power," from tyrannos "master" (see tyrant).[tyranny etymology, tyranny origin, 英语词源]