"索引" meaning in Japanese

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "索",
        "3": "引",
        "t1": "search for",
        "t2": "quote, cite",
        "tr1": "saku",
        "tr2": "in"
      },
      "expansion": "索 (saku, “search for”) + 引 (in, “quote, cite”)",
      "name": "compound"
    }
  ],
  "etymology_text": "From 索 (saku, “search for”) + 引 (in, “quote, cite”).",
  "forms": [
    {
      "form": "索引",
      "ruby": [
        [
          "索",
          "さく"
        ],
        [
          "引",
          "いん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sakuin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さくいん"
      },
      "expansion": "索(さく)引(いん) • (sakuin)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "index to a book",
          "roman": "shomotsu no sakuin",
          "ruby": [
            [
              "書物",
              "しょもつ"
            ],
            [
              "索引",
              "さくいん"
            ]
          ],
          "text": "書物の索引"
        },
        {
          "english": "to add an index to",
          "roman": "sakuin o tsukeru",
          "ruby": [
            [
              "索引",
              "さくいん"
            ],
            [
              "付",
              "つ"
            ]
          ],
          "text": "索引を付ける"
        }
      ],
      "glosses": [
        "index, indices, indexes"
      ],
      "id": "en-索引-ja-noun-YtzOVrlJ",
      "links": [
        [
          "index",
          "index"
        ],
        [
          "indices",
          "indices"
        ],
        [
          "indexes",
          "indexes"
        ]
      ],
      "related": [
        {
          "english": "subject index",
          "roman": "jikō sakuin",
          "ruby": [
            [
              "事項索引",
              "じこうさくいん"
            ]
          ],
          "word": "事項索引"
        }
      ]
    }
  ],
  "sounds": [
    {
      "other": "さくいん"
    },
    {
      "ipa": "[sa̠kɯ̟ᵝĩɴ]"
    }
  ],
  "word": "索引"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "索",
        "3": "引",
        "t1": "search for",
        "t2": "quote, cite",
        "tr1": "saku",
        "tr2": "in"
      },
      "expansion": "索 (saku, “search for”) + 引 (in, “quote, cite”)",
      "name": "compound"
    }
  ],
  "etymology_text": "From 索 (saku, “search for”) + 引 (in, “quote, cite”).",
  "forms": [
    {
      "form": "索引",
      "ruby": [
        [
          "索",
          "さく"
        ],
        [
          "引",
          "いん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "sakuin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "さくいん"
      },
      "expansion": "索(さく)引(いん) • (sakuin)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "english": "subject index",
      "roman": "jikō sakuin",
      "ruby": [
        [
          "事項索引",
          "じこうさくいん"
        ]
      ],
      "word": "事項索引"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese compound terms",
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with redundant sortkeys",
        "Japanese terms with usage examples",
        "Japanese terms written with two Han script characters"
      ],
      "examples": [
        {
          "english": "index to a book",
          "roman": "shomotsu no sakuin",
          "ruby": [
            [
              "書物",
              "しょもつ"
            ],
            [
              "索引",
              "さくいん"
            ]
          ],
          "text": "書物の索引"
        },
        {
          "english": "to add an index to",
          "roman": "sakuin o tsukeru",
          "ruby": [
            [
              "索引",
              "さくいん"
            ],
            [
              "付",
              "つ"
            ]
          ],
          "text": "索引を付ける"
        }
      ],
      "glosses": [
        "index, indices, indexes"
      ],
      "links": [
        [
          "index",
          "index"
        ],
        [
          "indices",
          "indices"
        ],
        [
          "indexes",
          "indexes"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "さくいん"
    },
    {
      "ipa": "[sa̠kɯ̟ᵝĩɴ]"
    }
  ],
  "word": "索引"
}