eighteenth(the ordinal form of the number eighteen, see also: 18th) adjective [UK: ˌeɪ.ˈtiːnθ] [US: e.ˈtiːnθ]He lived in the eighteenth century. = Visse nel diciottesimo secolo.
diciottesimonoun {m}
eighteenth(the person or thing in the eighteenth position) noun [UK: ˌeɪ.ˈtiːnθ] [US: e.ˈtiːnθ]He lived in the eighteenth century. = Visse nel diciottesimo secolo.