PRIMOGENITOR Meaning of PRIMOGENITOR in English [ ˌprʌɪmə(ʊ)'dʒɛnɪtə ]■ noun the earliest ancestor of a people; a progenitor.OriginC17: var. of progenitor , on the pattern of primogeniture . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004