quickly, rapidly, or immediately.
at a rapid tempo (used as a musical direction).
quick or rapid.
executed at a rapid tempo (used as a musical direction).
noun, plural prestos.
Music. a movement or piece in quick tempo.

1590–1600; < Italian: quick, quickly < Late Latin praestus (adj.) ready, Latin praestō (adv.) at hand Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
presto (ˈprɛstəʊ)
adj, —adv
1.  music to be played very fast
2.  immediately, suddenly, or at once (esp in the phrase hey presto)
n , -tos
3.  music a movement or passage directed to be played very quickly
[C16: from Italian: fast, from Late Latin praestus (adj) ready to hand, Latin praestō (adv) present]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1598, "quickly," used by conjurers, etc., from It. presto "quick, quickly" in conjuror's patter, from L. præstus "ready," præsto (adv.) "ready, available," from præ "before" + stare "to stand," from PIE base *sta- "to stand" (see stet). Cf. L. præsto
esse "to be at hand, be ready," source of Fr. prêt "ready." As a musical direction, it is a separate borrowing from It., first recorded 1683.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

PRESTO definition

A parallel language for shared-memory multiprocessors, built on top of C++ by Bershad et al, U Washington 1987. PRESTO provides classes for threads and spinlocks as well as Mesa-style monitors and condition variables.
( E-mail:
["PRESTO: A Kernel for Parallel Programming Environments", B.N. Bershad et al, U Wash CS TR, Jan 1987].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
And then, presto, he's about in our midst giving an imitation of a wet hen with
  a brood of ducks.
Cooler air rushes in from the ocean to take its place and presto, a wind is
Collect enough tickets and, presto, you have a degree.
When this slippage happens abruptly, presto, you've got an earthquake.
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