[pres.to] adv or adj [It, quick, quickly, fr. L praestus ready, fr. praesto, adv., on hand; akin to L prae before--more at for] (ca. 1599) 1: suddenly as if by magic: immediately
2: at a rapid tempo--used as a direction in music
[2]presto n, pl prestos (1869): a presto musical passage or movement