According to the search results, "serioso" in music means "seriously" or conveys a serious mood, often implying pathos and solemnity. Beethoven titled some of his works "Quartett[o] Serioso" to convey this serious character, such as his String Quartet No. 11 in F minor, Op. 95 from 1810, commonly known as the "Serioso Quartet".
A directive to perform the indicated passage of a composition in a grave, serious, sedate manner.
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