dictator
US /ˈdɪk.teɪ.t̬ɚ/
UK /ˈdɪk.teɪ.t̬ɚ/
1.
a ruler with total power over a country, typically one who has obtained power by force
:
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The country was ruled by a ruthless dictator for decades.
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The people rose up against the oppressive dictator.