Definition of potentate noun from the Oxford Advanced Learner's Dictionary

 

potentate

 noun
noun
BrE BrE//ˈpəʊtnteɪt//
 
; NAmE NAmE//ˈpoʊtnteɪt//
 
(literary, often disapproving)
 
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a ruler who has a lot of power, especially when this is not restricted by a parliament, etc. Word Origin late Middle English: from Latin potentatus ‘dominion’, from potent- ‘being able or powerful’, from the verb posse.
See the Oxford Advanced American Dictionary entry: potentate