"index rerum" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "-"
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      "expansion": "Latin",
      "name": "uder"
    },
    {
      "args": {
        "1": "la",
        "2": "index"
      },
      "expansion": "index",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "rerum"
      },
      "expansion": "rerum",
      "name": "m"
    }
  ],
  "etymology_text": "Latin: index + rerum.",
  "forms": [
    {
      "form": "index rerums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "index rerum (plural index rerums)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A tabulated and alphabetized notebook, for systematic preservation of items, quotations, etc."
      ],
      "id": "en-index_rerum-en-noun-gLDMpqiR"
    },
    {
      "categories": [
        {
          "_dis": "30 70",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
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        {
          "_dis": "24 76",
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
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          "source": "w+disamb"
        }
      ],
      "coordinate_terms": [
        {
          "_dis1": "0 100",
          "word": "index nominum"
        },
        {
          "_dis1": "0 100",
          "word": "index locorum"
        },
        {
          "_dis1": "0 100",
          "word": "index verborum"
        }
      ],
      "glosses": [
        "An index of subjects; used when a work contains multiple indices, such as one for personal names (index nominum), passages cited (index locorum), or words (index verborum)"
      ],
      "id": "en-index_rerum-en-noun-jeuEGMgG",
      "links": [
        [
          "index",
          "index"
        ],
        [
          "subject",
          "subject"
        ],
        [
          "index nominum",
          "index nominum"
        ],
        [
          "index locorum",
          "index locorum"
        ],
        [
          "index verborum",
          "index verborum"
        ]
      ]
    }
  ],
  "word": "index rerum"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English terms derived from Latin",
    "English undefined derivations"
  ],
  "coordinate_terms": [
    {
      "word": "index nominum"
    },
    {
      "word": "index locorum"
    },
    {
      "word": "index verborum"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
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      },
      "expansion": "Latin",
      "name": "uder"
    },
    {
      "args": {
        "1": "la",
        "2": "index"
      },
      "expansion": "index",
      "name": "m"
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    {
      "args": {
        "1": "la",
        "2": "rerum"
      },
      "expansion": "rerum",
      "name": "m"
    }
  ],
  "etymology_text": "Latin: index + rerum.",
  "forms": [
    {
      "form": "index rerums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "index rerum (plural index rerums)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A tabulated and alphabetized notebook, for systematic preservation of items, quotations, etc."
      ]
    },
    {
      "glosses": [
        "An index of subjects; used when a work contains multiple indices, such as one for personal names (index nominum), passages cited (index locorum), or words (index verborum)"
      ],
      "links": [
        [
          "index",
          "index"
        ],
        [
          "subject",
          "subject"
        ],
        [
          "index nominum",
          "index nominum"
        ],
        [
          "index locorum",
          "index locorum"
        ],
        [
          "index verborum",
          "index verborum"
        ]
      ]
    }
  ],
  "word": "index rerum"
}