Merriam-Webster Collegiate Dictionary - presto

 I. interjection  Etymology: Italian, quick, quickly, from Latin praestus ready, from praesto adverb, on hand; akin to Latin prae before — more at for  Date: circa 1599 — used to indicate the sudden appearance or occurrence of something often as if by magic  II. adverb or adjective  Date: 1644  1. suddenly as if by magic ; immediately  2. at a rapid tempo — used as a direction in music  III. noun  (plural ~s)  Date: 1801 a ~ musical passage or movement