n. The principal church of a bishop's diocese, containing the episcopal throne.n. A large, important church.n. Something that resembles a cathedral, as in grandeur or authority.adj. Of, relating to, or containing a bishop's throne: a cathedral church. adj. Relating to or issuing from a chair of office or authority; authoritative.adj. Of, relating to, or resembling a cathedral: tall trees whose branches met to form cathedral arches over the path.