Aonian UK /eɪˈəʊ.ni.ən/US /eɪˈoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Pertaining to Aonia, or to the Muses, who were supposed to dwell there.The Aonian fount stood at the foot of Mount Helicon, not far from Thebes, and was sacred to the Muses. noun1 •An inhabitant of Aonia. formsAonians · more Aonian · most Aonian