OPERA n. 2 definitions
A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arials, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama.
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 an…
PART n.
A particular character in a drama or a play; an assumed personification; also, the language, actions, and influence of a character or an actor in a play; or, figuratively, in real life. See To act a part, under Act. That part Was aptly fitted and naturally performed. Shak. It was a brute part of him to kill so capital…