"indexing language" meaning in English

{
  "forms": [
    {
      "form": "indexing languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "indexing language (plural indexing languages)",
      "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": "topical",
          "langcode": "en",
          "name": "Information science",
          "orig": "en:Information science",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A controlled set of terms selected from natural language and used to represent, in summary form, the subjects of documents within a given field of knowledge."
      ],
      "id": "en-indexing_language-en-noun-M3cWaLYq",
      "links": [
        [
          "information science",
          "information science"
        ],
        [
          "natural language",
          "natural language"
        ]
      ],
      "raw_glosses": [
        "(information science) A controlled set of terms selected from natural language and used to represent, in summary form, the subjects of documents within a given field of knowledge."
      ],
      "related": [
        {
          "word": "index term"
        }
      ],
      "synonyms": [
        {
          "word": "descriptor language"
        }
      ],
      "topics": [
        "computing",
        "engineering",
        "human-sciences",
        "information-science",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "controlled set of terms",
          "word": "indeksointikieli"
        }
      ]
    }
  ],
  "word": "indexing language"
}

{
  "forms": [
    {
      "form": "indexing languages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "indexing language (plural indexing languages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "index term"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Information science"
      ],
      "glosses": [
        "A controlled set of terms selected from natural language and used to represent, in summary form, the subjects of documents within a given field of knowledge."
      ],
      "links": [
        [
          "information science",
          "information science"
        ],
        [
          "natural language",
          "natural language"
        ]
      ],
      "raw_glosses": [
        "(information science) A controlled set of terms selected from natural language and used to represent, in summary form, the subjects of documents within a given field of knowledge."
      ],
      "topics": [
        "computing",
        "engineering",
        "human-sciences",
        "information-science",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "descriptor language"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "controlled set of terms",
      "word": "indeksointikieli"
    }
  ],
  "word": "indexing language"
}