"既約分数" meaning in Japanese

{
  "forms": [
    {
      "form": "既約分数",
      "ruby": [
        [
          "既",
          "き"
        ],
        [
          "約",
          "やく"
        ],
        [
          "分",
          "ぶん"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kiyaku bunsū",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kyakubunsuu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "きやくぶんすう",
      "roman": "kyakubunsuu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きやく ぶんすう",
        "head": "既約分数",
        "hhira": "きやくぶんすう"
      },
      "expansion": "既(き)約(やく)分(ぶん)数(すう) • (kiyaku bunsū) ^(←きやくぶんすう (kyakubunsuu)?)",
      "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 4 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with multiple readings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "ja",
          "name": "Mathematics",
          "orig": "ja:Mathematics",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "irreducible fraction"
      ],
      "id": "en-既約分数-ja-noun-~9PZMLpn",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "irreducible",
          "irreducible"
        ],
        [
          "fraction",
          "fraction"
        ]
      ],
      "raw_glosses": [
        "(mathematics) irreducible fraction"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "ja:既約分数"
      ]
    }
  ],
  "sounds": [
    {
      "other": "きやくぶんすう"
    },
    {
      "ipa": "[kʲija̠kɯ̟ bɯ̟̃ɰ̃sɨː]"
    }
  ],
  "word": "既約分数"
}

{
  "forms": [
    {
      "form": "既約分数",
      "ruby": [
        [
          "既",
          "き"
        ],
        [
          "約",
          "やく"
        ],
        [
          "分",
          "ぶん"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kiyaku bunsū",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "kyakubunsuu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "きやくぶんすう",
      "roman": "kyakubunsuu",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きやく ぶんすう",
        "head": "既約分数",
        "hhira": "きやくぶんすう"
      },
      "expansion": "既(き)約(やく)分(ぶん)数(すう) • (kiyaku bunsū) ^(←きやくぶんすう (kyakubunsuu)?)",
      "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 fourth grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with 4 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with multiple readings",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Mathematics"
      ],
      "glosses": [
        "irreducible fraction"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "irreducible",
          "irreducible"
        ],
        [
          "fraction",
          "fraction"
        ]
      ],
      "raw_glosses": [
        "(mathematics) irreducible fraction"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "ja:既約分数"
      ]
    }
  ],
  "sounds": [
    {
      "other": "きやくぶんすう"
    },
    {
      "ipa": "[kʲija̠kɯ̟ bɯ̟̃ɰ̃sɨː]"
    }
  ],
  "word": "既約分数"
}