postsectarian adjective 1noun 1forms 3 adjective1 •After or beyond sects or sectarianism, especially as a reaction to sectarianism.Indeed, the field reads like postsectarian, postpartisan Australia's collective sigh of relief at having left behind what Robert Alford, in 1963, called our 'politics of class and religion'. — 2001 noun1 •(rare) An adherent of postsectarian philosophy. formspostsectarians · more postsectarian · most postsectarian