Last Updated：2025/11/26

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A musical interval of the Western twelve-semitone system consisting of five semitones and spanning four degrees of the diatonic scale. It is enharmonically equivalent to an augmented third.

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perfect fourth

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Source Word

perfect fourth

Noun

A musical interval of the Western twelve-semitone system consisting of five semitones and spanning four degrees of the diatonic scale. It is enharmonically equivalent to an augmented third.

Japanese Meaning

完全四度：西洋音楽の十二平均律体系において、五半音から成る音程であり、ダイアトニック・スケール上で四つの音階にまたがる音程（増三度と同音となる）。

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Google Translation / DeepL Translation

ギターをチューニングするとき、ほとんどの弦の間隔は完全四度であり、それがフレットボード上のコードの形を保つのに役立ちます。

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A musical interval of the Western twelve-semitone system consisting of five semitones and spanning four degrees of the diatonic scale. It is enharmonically equivalent to an augmented third.