"sinnum" meaning in Icelandic

{
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "sinn",
        "3": "",
        "4": "time"
      },
      "expansion": "sinn (“time”)",
      "name": "m"
    }
  ],
  "etymology_text": "From sinn (“time”).",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "prepositions"
      },
      "expansion": "sinnum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Icelandic prepositions",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "sinnuma"
        }
      ],
      "examples": [
        {
          "english": "Five times sixteen is eighty.",
          "text": "Fimm sinnum sextán eru áttatíu.",
          "type": "example"
        }
      ],
      "glosses": [
        "times, by"
      ],
      "id": "en-sinnum-is-prep-LCfT8sCX",
      "links": [
        [
          "times",
          "times"
        ],
        [
          "by",
          "by"
        ]
      ],
      "related": [
        {
          "word": "deilt með"
        },
        {
          "word": "plús"
        },
        {
          "word": "mínus"
        }
      ]
    }
  ],
  "word": "sinnum"
}

{
  "derived": [
    {
      "word": "sinnuma"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "sinn",
        "3": "",
        "4": "time"
      },
      "expansion": "sinn (“time”)",
      "name": "m"
    }
  ],
  "etymology_text": "From sinn (“time”).",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "prepositions"
      },
      "expansion": "sinnum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prep",
  "related": [
    {
      "word": "deilt með"
    },
    {
      "word": "plús"
    },
    {
      "word": "mínus"
    }
  ],
  "senses": [
    {
      "categories": [
        "Icelandic entries with incorrect language header",
        "Icelandic lemmas",
        "Icelandic prepositions",
        "Icelandic terms with usage examples"
      ],
      "examples": [
        {
          "english": "Five times sixteen is eighty.",
          "text": "Fimm sinnum sextán eru áttatíu.",
          "type": "example"
        }
      ],
      "glosses": [
        "times, by"
      ],
      "links": [
        [
          "times",
          "times"
        ],
        [
          "by",
          "by"
        ]
      ]
    }
  ],
  "word": "sinnum"
}