pontifician adjective 1noun 1forms 3 adjective1 •Of or relating to the pontiff or pope.Pontifician Laws — 1645 noun1 •(no longer used) One who adheres to the pope or papacy; a papist.Freewill made no such controversie among moderate men , either of the Pontifician or Protestant side — 1625 formspontificians · more pontifician · most pontifician