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presto (adv.)

1590s, "quickly, immediately," a word used by conjurers, etc., from Italian presto "quick, quickly" in conjuror's patter, from Latin praestus "ready," praesto (adv.) "ready, available," from prae "before" (see pre-) + stare "to stand," from PIE root *sta- "to stand, make or be firm." Compare Latin praesto esse "to be at hand, be ready," source of French prêt "ready," and compare press (v.2). As a musical direction, "in rapid tempo," it is a separate borrowing from Italian, first recorded 1680s (Purcell).

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Definitions of presto from WordNet
1
presto (adv.)
suddenly; "Presto! begone! 'tis here again"- Swift;
presto (adv.)
at a very fast tempo (faster than allegro);
2
presto (adj.)
(of tempo) very fast;
From wordnet.princeton.edu