Webster's English Dictionary

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presto

1. pres.to \'pres-(.)to-\ av(or aj) [It, quick, quickly, fr. L praestus 
   ready, fr. praesto, adv. on han]d; akin to L prae before - more at FOR 1: 
   at once : QUICKLY  2: at a rapid tempo - used as a direction in music 
2. presto n : a presto musical passage or movement