WordReference Random House Unabridged Dictionary of American English © 2020
grand opera, 
  • Music and Dancea serious, usually tragic, opera in which most of the text is set to music.
    • 1795–1805

    Collins Concise English Dictionary © HarperCollins Publishers::
    grand opera n
    1. an opera that has a serious plot and is entirely in musical form, with no spoken dialogue
    'grand opera' also found in these entries (note: many are not synonyms or translations):
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