"perfect fourth" meaning in English

{
  "etymology_text": "The word perfect refers to the fact that so-called perfect intervals are neither major nor minor.",
  "forms": [
    {
      "form": "perfect fourths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "perfect fourth (plural perfect fourths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The perfect fourth has a pitch ratio close to 4:3."
        }
      ],
      "glosses": [
        "A musical interval spanning four degrees of the diatonic scale. In the Western twelve-semitone system, it consists of five standard semitones."
      ],
      "id": "en-perfect_fourth-en-noun-DZePZDMx",
      "links": [
        [
          "musical interval",
          "musical interval"
        ],
        [
          "diatonic scale",
          "diatonic scale"
        ],
        [
          "semitone",
          "semitone"
        ]
      ],
      "related": [
        {
          "word": "augmented fourth"
        },
        {
          "word": "diminished fourth"
        }
      ],
      "synonyms": [
        {
          "word": "P4"
        }
      ]
    }
  ],
  "word": "perfect fourth"
}

{
  "etymology_text": "The word perfect refers to the fact that so-called perfect intervals are neither major nor minor.",
  "forms": [
    {
      "form": "perfect fourths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "perfect fourth (plural perfect fourths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "augmented fourth"
    },
    {
      "word": "diminished fourth"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Music"
      ],
      "examples": [
        {
          "text": "The perfect fourth has a pitch ratio close to 4:3."
        }
      ],
      "glosses": [
        "A musical interval spanning four degrees of the diatonic scale. In the Western twelve-semitone system, it consists of five standard semitones."
      ],
      "links": [
        [
          "musical interval",
          "musical interval"
        ],
        [
          "diatonic scale",
          "diatonic scale"
        ],
        [
          "semitone",
          "semitone"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "P4"
    }
  ],
  "word": "perfect fourth"
}