Definition of "vivacissimo" []

• In music, very lively: noting passages to be rendered with great rapidity and brilliancy.

The Century Dictionary (Public Domain)

• "_Presto_, _prestissimo_, _vivacissimo_, and _prestissimo possibile_ -- the most rapid tempo possible."
• ""Christabel," more than anything of Coleridge, is composed like music; you might set at the side of each section, especially of the opening, _largo, vivacissimo_, and, as the general expression signature, _tempo rubato_."
• "It breaks out again _vivacissimo accelerando_ when Miss"