What is the meaning of tune?

noun

• A succession of notes forming a distinctive sequence.
  • usage: "she was humming an air from Beethoven"
  • synonyms: melody, air, strain, melodic line, line, melodic phrase
• The property of producing accurately a note of a given pitch.
  • usage: "he cannot sing in tune"; "the clarinet was out of tune"
• The adjustment of a radio receiver or other circuit to a required frequency.

verb

• Adjust for (better) functioning.
  • usage: "tune the engine"
  • synonyms: tune up
• Adjust the pitches of (musical instruments. )
  • usage: "My piano needs to be tuned"
  • synonyms: tune up