Lusitania1 Syllabification: (Lu·si·ta·ni·a)Pronunciation: /ˌlo͞osəˈtānēə, -nyə/Definition of Lusitania an ancient Roman province on the Iberian peninsula that corresponds to modern Portugal. Derivatives Lusitanian adjective & noun Lusitania in other Oxford dictionaries Definition of Lusitania in the British & World English dictionary