Tyrant

A tyrant (from Greek τυραννοσ) is one possessing absolute governmental power. In Classical Antiquity the word tyrant did not always have inherently negative implications; it merely designated anyone who assumed power for any period of time without a legitimate basis of authority.

The first to have the title of tyrant was Pisistratus in 560 BC.

In modern times tyrant has come to mean a dictator who rules with cruelty.

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Bullying is a form of tyranny within a family, among schoolchildren, etc.