Tironian UK /taɪˈɹəʊ.ni.ən/US /taɪˈɹoʊ.ni.ən/ adjective2 •Of or pertaining to Marcus Tullius Tiro (died circa 4 BCE), scribe of Cicero and inventor of an early shorthand. •Of or relating to Tironian notes. formsmore Tironian · most Tironian