archiepiscopal a of or associated with an archbishop an archiepiscopal see Usage(s) At the archiepiscopal palace on the city heights, the new archbishop took his vows before the Quebec Metropolitan Chapter. All the while, apparently, they were being trucked into the cellar of his archiepiscopal palace. When in 1930 he went to Saskatchewan, Archbishop McGuigan found a fine archiepiscopal palace, no seminary. Synonym(s) archepiscopal