potentate UK /ˈpəʊ.tən.teɪt/US /ˈpoʊ.tən.teɪt/noun 4adjective 1forms 3 noun4 •A powerful leader; a monarch; a ruler.But Kings and mightiest Potentates must die, For that's the end of humane miserie. — 1591 •A powerful polity or institution. •(humorous) Someone acting in an important role."Those foreigners," thought the female potentate of the Sun, "won't know what to order; but I'll show them what a good supper is." — 1834 •A self-important person. adjective1 •(no longer used) Regnant, powerful, dominant. formspotentates · more potentate · most potentate