THEARCHY Meaning of THEARCHY in English [ 'θi:α:ki ]■ noun ( plural thearchies ) archaic rule by a god or gods.OriginC17: from eccles. Gk thearkhia 'godhead', from theos 'god' + arkhein 'to rule'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004