All 4 Uses

opera
in
The Great Fire
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Crosby's Opera House burns while pedestrians scamper to safety.†
p. 44.1 *

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)
Just moments before this scene, a restaurant in the opera house was still serving customers.†
p. 44.2
The storm of falling fire seemed to increase every second....Looking back ...toward the Opera House, I saw the smoke and flames pouring out of State Street, from the very point we had just left, and the intervening space was filled with the whirling embers that beat against the houses and covered the roofs and windowsills.†
p. 67.9
Crosby's Opera House†
p. 99.1

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.