A drama, either tragic or comic, of which music forms an essential part; a drama wholly or mostly sung, consisting of recitative, arias, choruses, duets, trios, etc., with orchestral accompaniment, preludes, and interludes, together with appropriate costumes, scenery, and action; a lyric drama, drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes, A building designed for the performance of such works; an opera house