Definition of "pianississimo" []

• The musical notation indicating that the piece should be played quieter than pianissimo. Abbreviation: ppp. (adverb)

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• "So for example, for three pianos, it's pianississimo."
• "In the third measure, the volume changes to a pianississimo for the exposition of the theme."
• "L'Enfance du Christ "is probably the composer's most gentle choral work, characterized by numerous dynamic markings instructing that passages be played piano (soft), pianissimo (very soft), and even pianississimo"