hierocracy Syllabification: (hi·er·oc·ra·cy)Pronunciation: /ˌhī(ə)ˈräkrəsē/Definition of hierocracy noun (plural hierocracies) rule by priests. a ruling body composed of priests. Derivatives hierocraticPronunciation: /ˌhī(ə)rəˈkratik/ adjective hierocracy in other Oxford dictionaries Definition of hierocracy in the British & World English dictionary