fetial /ˈfiːʃəl/adjective 2noun 1forms 1 adjective2 •Of or relating to a fetial (member of the Roman college of priests who acted as representatives in disputes with foreign nations); (by extension) ambassadorial, heraldic. •Concerned with declarations of war and treaties of peace. noun1 •(historical) A member of the Roman college of priests who acted as representatives in disputes with foreign nations.Nicomachus, as explained in the next line, was already known to the Elean priests or fetials, or whatever we are to call them, as a guest-friend. — 1892 formsfetials