"fjórum" meaning in Icelandic

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "numeral form"
      },
      "expansion": "fjórum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "I am loved by four men.",
          "text": "Ég er elskuð af fjórum mönnum.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "extra": "four",
          "word": "fjórir"
        }
      ],
      "glosses": [
        "dative of fjórir (“four”)"
      ],
      "id": "en-fjórum-is-num-FmVgo9oD",
      "links": [
        [
          "fjórir",
          "fjórir#Icelandic"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "word": "fjórum"
}

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "numeral form"
      },
      "expansion": "fjórum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Icelandic entries with incorrect language header",
        "Icelandic non-lemma forms",
        "Icelandic numeral forms",
        "Icelandic terms with usage examples",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "I am loved by four men.",
          "text": "Ég er elskuð af fjórum mönnum.",
          "type": "example"
        }
      ],
      "form_of": [
        {
          "extra": "four",
          "word": "fjórir"
        }
      ],
      "glosses": [
        "dative of fjórir (“four”)"
      ],
      "links": [
        [
          "fjórir",
          "fjórir#Icelandic"
        ]
      ],
      "tags": [
        "dative",
        "form-of"
      ]
    }
  ],
  "word": "fjórum"
}