"IV" meaning in Latin

{
  "etymology_number": 1,
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "proper noun"
      },
      "expansion": "IV",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Jupiter",
          "word": "Iupiter"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Latin links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Latin links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "100 0",
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "100 0",
          "kind": "topical",
          "name": "Latin cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Abbreviation of Iupiter (“Jupiter”)."
      ],
      "id": "en-IV-la-name-aTAVFPHf",
      "links": [
        [
          "Iupiter",
          "Iupiter#Latin"
        ],
        [
          "Jupiter",
          "Jupiter"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "IV"
}

{
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "numeral"
      },
      "expansion": "IV",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "glosses": [
        "4"
      ],
      "id": "en-IV-la-num-SyJ3d9Td",
      "links": [
        [
          "4",
          "4"
        ]
      ]
    }
  ],
  "word": "IV"
}

{
  "categories": [
    "Latin cardinal numbers",
    "Latin entries with incorrect language header",
    "Latin lemmas",
    "Latin numerals",
    "Latin proper nouns",
    "Pages with 3 entries",
    "Pages with entries"
  ],
  "etymology_number": 1,
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "proper noun"
      },
      "expansion": "IV",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "Jupiter",
          "word": "Iupiter"
        }
      ],
      "categories": [
        "Latin abbreviations",
        "Latin links with redundant alt parameters",
        "Latin links with redundant wikilinks"
      ],
      "glosses": [
        "Abbreviation of Iupiter (“Jupiter”)."
      ],
      "links": [
        [
          "Iupiter",
          "Iupiter#Latin"
        ],
        [
          "Jupiter",
          "Jupiter"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "IV"
}

{
  "categories": [
    "Latin cardinal numbers",
    "Latin entries with incorrect language header",
    "Latin lemmas",
    "Latin numerals",
    "Pages with 3 entries",
    "Pages with entries"
  ],
  "etymology_number": 2,
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "numeral"
      },
      "expansion": "IV",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "glosses": [
        "4"
      ],
      "links": [
        [
          "4",
          "4"
        ]
      ]
    }
  ],
  "word": "IV"
}