"Unknowns" meaning in All languages combined

{
  "forms": [
    {
      "form": "the Unknowns",
      "tags": [
        "canonical",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "p",
        "def": "1"
      },
      "expansion": "the Unknowns pl (plural only)",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Those US military personnel who have died in service, usually in war, without proper burial."
      ],
      "id": "en-Unknowns-en-name-gjcb7JxY",
      "raw_glosses": [
        "(US) Those US military personnel who have died in service, usually in war, without proper burial."
      ],
      "related": [
        {
          "word": "Unknown Soldier"
        },
        {
          "word": "Unknown Warrior"
        }
      ],
      "tags": [
        "US",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "Unknowns"
}

{
  "forms": [
    {
      "form": "the Unknowns",
      "tags": [
        "canonical",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "p",
        "def": "1"
      },
      "expansion": "the Unknowns pl (plural only)",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Unknown Soldier"
    },
    {
      "word": "Unknown Warrior"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English entries with incorrect language header",
        "English lemmas",
        "English pluralia tantum",
        "English proper nouns",
        "Pages with 1 entry"
      ],
      "glosses": [
        "Those US military personnel who have died in service, usually in war, without proper burial."
      ],
      "raw_glosses": [
        "(US) Those US military personnel who have died in service, usually in war, without proper burial."
      ],
      "tags": [
        "US",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "Unknowns"
}