Lateran Syllabification: (Lat·er·an)Pronunciation: /ˈlatərən/Definition of Lateran the site in Rome containing the cathedral church of Rome (a basilica dedicated to St. John the Baptist and St. John the Evangelist) and the Lateran Palace, where the popes resided until the 14th century. Lateran in other Oxford dictionaries Definition of Lateran in the British & World English dictionary