A Dictionary of Music and Musicians/Prestissimo
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PRESTISSIMO, 'very quickly,' indicates the highest rate of speed used in music. It is used, like Presto, generally for the whole movement, which is as a rule the finale. Examples in Beethoven's sonatas are, Op. 2, No. 1, and Op. 53. It is used for the second movement of Op. 109.
[ J. A. F. M. ]