"diminished fourth" meaning in English

{
  "forms": [
    {
      "form": "diminished fourths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "diminished fourth (plural diminished fourths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
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          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
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            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
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            "Fundamental"
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        }
      ],
      "glosses": [
        "A musical interval made by narrowing a perfect fourth by one chromatic semitone. In twelve-tone equal temperament, it consists of four semitones, spans four degrees of the diatonic scale, and is enharmonically equivalent to a major third."
      ],
      "id": "en-diminished_fourth-en-noun-GkujrmL~",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "musical interval",
          "musical interval"
        ],
        [
          "perfect fourth",
          "perfect fourth"
        ],
        [
          "semitones",
          "semitone"
        ],
        [
          "diatonic scale",
          "diatonic scale"
        ],
        [
          "enharmonically",
          "enharmonically"
        ],
        [
          "major third",
          "major third"
        ]
      ],
      "raw_glosses": [
        "(music) A musical interval made by narrowing a perfect fourth by one chromatic semitone. In twelve-tone equal temperament, it consists of four semitones, spans four degrees of the diatonic scale, and is enharmonically equivalent to a major third."
      ],
      "related": [
        {
          "word": "perfect fourth"
        },
        {
          "word": "augmented fourth"
        },
        {
          "word": "major third"
        }
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "diminished fourth"
}

{
  "forms": [
    {
      "form": "diminished fourths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "diminished fourth (plural diminished fourths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "perfect fourth"
    },
    {
      "word": "augmented fourth"
    },
    {
      "word": "major third"
    }
  ],
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        "English nouns",
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      "glosses": [
        "A musical interval made by narrowing a perfect fourth by one chromatic semitone. In twelve-tone equal temperament, it consists of four semitones, spans four degrees of the diatonic scale, and is enharmonically equivalent to a major third."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "musical interval",
          "musical interval"
        ],
        [
          "perfect fourth",
          "perfect fourth"
        ],
        [
          "semitones",
          "semitone"
        ],
        [
          "diatonic scale",
          "diatonic scale"
        ],
        [
          "enharmonically",
          "enharmonically"
        ],
        [
          "major third",
          "major third"
        ]
      ],
      "raw_glosses": [
        "(music) A musical interval made by narrowing a perfect fourth by one chromatic semitone. In twelve-tone equal temperament, it consists of four semitones, spans four degrees of the diatonic scale, and is enharmonically equivalent to a major third."
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "diminished fourth"
}