A tune is what you whistle when you're feeling cheerful. It's a melody or a specific sequence of musical notes.

Before playing a tune on your guitar, you might want to tune it — in other words, adjust its pitch so it sounds right. As a verb, there are several meanings of tune. You can tune a radio, or adjust the dial until you can heard a certain station, and you can tune a car, or adjust its engine so it works correctly. Tune comes from tone and its Proto-Indo-European root, ten-, "to stretch."

Definitions of tune
  1. noun
    a succession of notes forming a distinctive sequence
    synonyms: air, line, melodic line, melodic phrase, melody, strain
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    fanfare, flourish, tucket
    (music) a short lively tune played on brass instruments
    a rapid series of ascending or descending notes on the musical scale
    (music) an elaborate run of several notes sung to one syllable
    leitmotif, leitmotiv
    a melodic phrase that accompanies the reappearance of a person or situation (as in Wagner's operas)
    theme song
    a melody that recurs and comes to represent a musical play or movie
    signature, signature tune, theme song
    a melody used to identify a performer or a dance band or radio/tv program
    idea, melodic theme, musical theme, theme
    (music) melodic subject of a musical composition
    part, voice
    the melody carried by a particular voice or instrument in polyphonic music
    slide, swoop
    (music) rapid sliding up or down the musical scale
    motif, motive
    a theme that is repeated or elaborated in a piece of music
    (music) the presentation of a musical theme
    a repetition of a musical theme in which it is modified or embellished
    the principal part of a duet (especially a piano duet)
    the second or lower part of a duet (especially a piano duet)
    voice part
    a part written for a singer
    accompaniment, backup, musical accompaniment, support
    a musical part (vocal or instrumental) that supports or provides background for other musical parts
    bass, bass part
    the lowest part in polyphonic music
    type of:
    an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner
  2. noun
    the property of producing accurately a note of a given pitch
    “he cannot sing in tune
    “the clarinet was out of tune
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    type of:
    the property of sound that varies with variation in the frequency of vibration
  3. noun
    the adjustment of a radio receiver or other circuit to a required frequency
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    type of:
    adjustment, alteration, modification
    the act of making something different (as e.g. the size of a garment)
  4. verb
    adjust the pitches of (musical instruments)
    “My piano needs to be tuned
    synonyms: tune up
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    cause to be out of tune
    type of:
    adjust, correct, set
    alter or regulate so as to achieve accuracy or conform to a standard
  5. verb
    adjust for (better) functioning
    tune the engine”
    synonyms: tune up
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    fine-tune, tweak
    adjust finely
    make fit for use
    tune in
    regulate (a radio or television set) in order to receive a certain station or program
    type of:
    adjust, correct, set
    alter or regulate so as to achieve accuracy or conform to a standard
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