decretal /dɪˈkɹiːtəɫ/noun 2adjective 1forms 3 noun2 •A papal decree, particularly one derived from an ecclesiastical letter.Or els is thys Goddis law, Decrees or decretals, Or holy sinodals, Or els provincyals, Thus within the wals Of holy church to deale[…]? — 1503 •(no longer used) Any decree or pronounced instruction.[…] picturals / Of Magistrates, of courts, of tribunals, / Of commen wealthes, of states, of pollicy, / Of lawes, of iudgements, and of decretals […] — 1590 adjective1 •Pertaining to a decree. formsdecretals · more decretal · most decretal