A musical composition for one or two instruments, usually in three or four movements. The sonata of the classic era in music had a definite arrangement for its movements: the first and fourth had a fast tempo, the second had a slow tempo, and the third was in either playful style (a “scherzo”) or in dance form (a “minuet”).
Sonata operating system
The code name for the major Mac OS release due in mid-1999.
(http://devworld.apple.com/mkt/informed/appledirections/mar97/roadmap.html).
(1997-10-15)