cathedral /kəˈθiːdɹəl/noun 4adjective 1forms 1 noun4 •The principal church serving as the office (and some as place of residence) of an archdiocese's/a diocese's archbishop/bishop which is symbolized by an episcopal throne known as the cathedra.The bishop presided over the ceremony from his seat in the cathedral. •(informal) A large or important church building. •(figurative) A large, impressive, lofty, and/or important building or place of some other kind. •A large buttressed structure built by certain termites. adjective1 •Relating to the office of a bishop or an archbishop. formscathedrals