1. the process of adjusting a musical instrument so that it produces the correct pitches
2. the process of adjusting a machine, engine, or electronic device to improve its performance
3. the process of adjusting a radio or television to receive a particular station or channel clearly

Examples

• The piano needs tuning before the concert.
• She spent an hour on the tuning of her guitar.
• The mechanic performed engine tuning to improve fuel efficiency.
• Fine tuning of the equipment took several days.
• The radio’s tuning was off, causing static.
• Proper tuning of the television improved the picture quality.
• The violin’s tuning was perfect for the performance.