Webster's Revised Unabridged Dictionary · 1913

Presto

Presto , adverb

[Italian or Sp. presto quick, quickly. See Prest, a.]

1.
Quickly; immediately; in haste; suddenly.
Presto! begone! 'tis here again. — Swift
2.
(Music) Quickly; rapidly; -- a direction for a quick, lively movement or performance; quicker than allegro, or any rate of time except prestissimo.