All 8 Uses

opera
in
Dubliners
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His liking for Mozart's music brought him sometimes to an opera or a concert: these were the only dissipations of his life.†
Chpt 11

opera = a musical play with orchestra in which most of the dialogue is sung (or the art form that consists of such musicals; or describing something as related to that art form)
He had appeared in grand opera.†
Chpt 13
One night, when an operatic artiste had fallen ill, he had undertaken the part of the king in the opera of Maritana at the Queen's Theatre.†
Chpt 13 *

operatic = relating to classical music plays in which most of the dialogue is sung
One night, when an operatic artiste had fallen ill, he had undertaken the part of the king in the opera of Maritana at the Queen's Theatre.†
Chpt 13

opera = a musical play with orchestra in which most of the dialogue is sung (or the art form that consists of such musicals; or describing something as related to that art form)
"The opera, is it?" said Mr. Kernan.†
Chpt 14
The subject of talk was the opera company which was then at the Theatre Royal.†
Chpt 15
Nobody answered this question and Mary Jane led the table back to the legitimate opera.†
Chpt 15
Why did they never play the grand old operas now, he asked, Dinorah, Lucrezia Borgia?†
Chpt 15

operas = classical music plays in which most of the dialogue is sung

Definitions:

(1) (opera)
a form of musical theater with orchestra in which most of the words are sung, often in a classical style and sometimes in a foreign language
(2) (meaning too rare to warrant focus)
Less commonly, the expression, soap opera, refers to a television or radio program that typically runs for many years and dramatizes the lives of a group of characters.