Quintilian Syllabification: (Quin·til·ian)Pronunciation: /kwinˈtilēən/Definition of Quintilian (circa ad 35-circa 96), Roman rhetorician; Latin name Marcus Fabius Quintilianus. He is noted for his Education of an Orator, a comprehensive treatment of the art of rhetoric and the training of an orator. Quintilian in other Oxford dictionaries Definition of Quintilian in the British & World English dictionary