"音階" meaning in Japanese

{
  "forms": [
    {
      "form": "音階",
      "ruby": [
        [
          "音",
          "おん"
        ],
        [
          "階",
          "かい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "onkai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "おんかい"
      },
      "expansion": "音(おん)階(かい) • (onkai)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "ja",
          "name": "Music",
          "orig": "ja:Music",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "五音音階: pentatonic scale"
        },
        {
          "word": "全音階: diatonic scale"
        },
        {
          "word": "半音階: chromatic scale"
        },
        {
          "word": "長音階: major scale"
        },
        {
          "word": "短音階: minor scale"
        },
        {
          "word": "旋律的短音階: melodic minor scale"
        },
        {
          "word": "和声的短音階: harmonic minor scale"
        }
      ],
      "glosses": [
        "musical scale"
      ],
      "id": "en-音階-ja-noun-uzUjQk9a",
      "links": [
        [
          "musical scale",
          "musical scale"
        ]
      ]
    }
  ],
  "word": "音階"
}

{
  "derived": [
    {
      "word": "五音音階: pentatonic scale"
    },
    {
      "word": "全音階: diatonic scale"
    },
    {
      "word": "半音階: chromatic scale"
    },
    {
      "word": "長音階: major scale"
    },
    {
      "word": "短音階: minor scale"
    },
    {
      "word": "旋律的短音階: melodic minor scale"
    },
    {
      "word": "和声的短音階: harmonic minor scale"
    }
  ],
  "forms": [
    {
      "form": "音階",
      "ruby": [
        [
          "音",
          "おん"
        ],
        [
          "階",
          "かい"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "onkai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "おんかい"
      },
      "expansion": "音(おん)階(かい) • (onkai)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with 2 kanji",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with redundant sortkeys",
        "Pages with 4 entries",
        "Pages with entries",
        "ja:Music"
      ],
      "glosses": [
        "musical scale"
      ],
      "links": [
        [
          "musical scale",
          "musical scale"
        ]
      ]
    }
  ],
  "word": "音階"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "音階"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "音階",
  "trace": ""
}