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Op"er*a (?), n. [It., fr. opera work, composition, opposed to an
improvisation, fr. L. opera pains work, fr. opus, operis, work, labor:
cf. F. opéra. See Operate.] 1. 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.
2. The score of a musical drama, either written or in print; a play set
to music.