 All kinds of "sermo" were spoken only, not written.If one wanted to refer to what in post-classical times was called classical Latin one resorted to the concept of ' ("latinity") or ' (adverb).If one spoke in the "lingua" or "sermo Latinus" one merely spoke Latin, but if one spoke ' or ' ("more Latinish") one spoke good Latin, and formal Latin had "", the quality of good Latin, about it.