tune
     n 1: a succession of notes forming a distinctive sequence; "she
          was humming an air from Beethoven" [syn: {melody}, {air},
           {strain}, {melodic line}, {line}, {melodic phrase}]
     2: the property of producing accurately a note of a given
        pitch; "he cannot sing in tune"; "the clarinet was out of
        tune"
     3: the adjustment of a radio receiver or other circuit to a
        required frequency
     v 1: adjust for (better) functioning; "tune the engine" [syn: {tune
          up}]
     2: of musical instruments; "My piano needs to be tuned" [syn: {tune
        up}] [ant: {untune}]
Source: WordNet® 2.0

tune vt. [from automotive or musical usage] To optimize a program or
   system for a particular environment, esp. by adjusting numerical
   parameters designed as {hook}s 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}.


Source: The Jargon File