opera

1 opera /ˈɑːpərə/ noun
plural operas
1 opera
/ˈɑːpərə/
noun
plural operas
Britannica Dictionary definition of OPERA
1 
[noncount] : a kind of performance in which actors sing all or most of the words of a play with music performed by an orchestra — often used before another noun — see also grand opera
2 
: a show in which opera is performed
[count]
[noncount]
3 
[count] : a group of actors who perform operas together — often used in names

— operatic

/ˌɑːpəˈrætɪk/ adjective [more operatic; most operatic]
2 opera
2 opera
Britannica Dictionary definition of OPERA
plural of opus