Illyrian Syllabification: (Il·lyr·i·an)Pronunciation: /iˈli(ə)rēən/Definition of Illyrian noun a native or inhabitant of ancient Illyria. the branch of the Indo-European family of languages possibly represented by modern Albanian. adjective of or relating to the ancient region of Illyria or its language. Illyrian in other Oxford dictionaries Definition of Illyrian in the British & World English dictionary