potentate

[ poht-n-teyt ]
/ ˈpoʊt nˌteɪt /

noun

a person who possesses great power, as a sovereign, monarch, or ruler.

Origin of potentate

1350–1400; Middle English < Late Latin potentātus potentate, Latin: power, dominion. See potent1, -ate3
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British Dictionary definitions for potentate

potentate

/ (ˈpəʊtənˌteɪt) /

noun

a person who possesses great power or authority, esp a ruler or monarch

Word Origin for potentate

C14: from Late Latin potentātus ruler, from Latin: rule, command, from potens powerful, from posse to be able
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012