WordWeb Online

1. (music) calibrating something (an instrument or electronic circuit) to a standard frequency

1. Adjust for (better) functioning
   "tune the engine";
   - tune up
    
2. Adjust the pitches of (musical instruments)
   "My piano needs to be tuned";
   - tune up

Derived forms: tunings

Type of: adjust, calibration, correct, set, standardisation [Brit], standardization

Antonym: untune

Encyclopedia: Tuning, William