All 6 Uses

opera
in
Okay for Now, by Schmidt
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She wore a bluish kind of gown that shimmered—it looked like something that someone about to go to an opera would wear (not that I've ever been to an opera, or would ever be caught dead at one.†
p. 46.2

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)
She wore a bluish kind of gown that shimmered—it looked like something that someone about to go to an opera would wear (not that I've ever been to an opera, or would ever be caught dead at one.†
p. 46.2
Can you imagine Joe Pepitone ever going to an opera?†
p. 46.3 *
No one would ever think to look there if he wanted to break in while she was away at the opera.†
p. 49.3
I followed the sound of her typing and dinging until I could see her through the glass door, typing madly in another opera dress.†
p. 67.9
Librettos of the Great Operas.†
p. 251.3

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.