Noun
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.
The score of a musical drama, either written or in print; a play set to music.
The house where operas are exhibited.
of Opus
Source: Webster's dictionaryNo good opera plot can be sensible, for people do not sing when they are feeling sensible. W. H. Auden
The Opera is obviously the first draft of a fine spectacle; it suggests the idea of one. Jean de La Bruyère
People are wrong when they say opera is not what it used to be. It is what it used to be. That is what's wrong with it. Noël Coward
The opera isn't over till the fat lady sings. American Proverb
Bed is the poor man's opera. Egyptian Proverb
The opera ain't over until the fat lady sings. English Proverb