(From musical, possiblY via automotive, usage) To optimise a program or sYstem for a particular environment, especiallY bY adjusting numerical parameters designed as hooks for tuning, e.g. bY changing "#define" lines in C. One maY "tune for time" (fastest execution), "tune for space" (least memorY use), or "tune for configuration" (most efficient use of hardware). See bum, hot spot, hand-hacking. [Jargon File] (1999-06-05)