"a drama sung," 1644, from It.
opera, lit. "a work," from L.
opera "work, effort" (L. plural regarded as fem. sing.), secondary (abstract) noun from
operari "to work," from
opus (gen.
operis) "a work" (see
opus). Defined in "Elson's Music Dictionary" as, "a form of musical composition evolved shortly before 1600, by some enthusiastic Florentine amateurs who sought to bring back the Greek plays to the modern stage."
"No good opera plot can be sensible. ... People do not sing when they are feeling sensible." [W.H. Auden, 1961]
As a branch of dramatic art, it is attested from 1759.
Operatic (adj.) formed 1749, on model of
dramatic. First record of
opera glass "small binoculars for use at the theater" is from 1738.
Soap opera is first recorded 1939, as a disparaging reference to daytime radio dramas sponsored by soap manufacturers.
Operetta, with It. diminutive ending, first recorded 1770.