Pres"to (?), adv. [It. or Sp. presto quick, quickly. See Prest, a.]
Quickly; immediately; in haste; suddenly.
Presto! begone! 'tis here again.
Quickly; rapidly; -- a direction for a quick, lively movement or performance; quicker than allegro, or any rate of time except prestissimo.
© Webster 1913.