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1. A cruel and oppressive dictator
   - autocrat, despot
    
2. In ancient Greece, a ruler who had seized power without legal right to it
    
3. Any person who exercises power in a cruel way
   "his father was a tyrant"

Derived forms: tyrants

See also: tyrannize, tyrannous

Type of: dictator, individual, mortal, person, potentate, ruler, somebody, someone, soul, swayer

Encyclopedia: Tyrant