Oratorian :: Oratorian (n.) See Fathers of the Oratory, under Oratory..
Oratorical :: Oratorical (a.) Of or pertaining to an orator or to oratory; characterized by oratory; rhetorical; becoming to an orator; as, an oratorical triumph; an oratorical essay..
Oratorio :: Oratorio (n.) A more or less dramatic text or poem, founded on some Scripture nerrative, or great divine event, elaborately set to music, in recitative, arias, grand choruses, etc., to be sung with an orchestral accompaniment, but without action, scenery, or costume, although the oratorio grew out of the Mysteries and the Miracle and Passion plays, which were acted..
Oratorio :: Oratorio (n.) Performance or rendering of such a composition.