"fol" meaning in Volapük

{
  "etymology_templates": [
    {
      "args": {
        "1": "vo",
        "2": "en",
        "3": "four"
      },
      "expansion": "Borrowed from English four",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from English four.",
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "numeral"
      },
      "expansion": "fol",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 16 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Volapük cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Volapük entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "7 0 1 8 0 1 0 0 0 3 0 0 0 0 0 0 0 8 12 12 9 7 12 12 0 7 0",
          "kind": "other",
          "name": "Pages with 16 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "7 0 1 7 0 1 0 0 0 4 0 0 0 0 0 0 0 8 11 11 9 7 11 11 0 10 0",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "folam"
        },
        {
          "word": "folüm"
        }
      ],
      "examples": [
        {
          "english": "Four times four is sixteen.",
          "ref": "1932, Arie de Jong, Leerboek der Wereldtaal, page 23:",
          "text": "Folna fol binos degmäl.",
          "type": "quote"
        }
      ],
      "glosses": [
        "four"
      ],
      "id": "en-fol-vo-num-BO-vCA9a",
      "links": [
        [
          "four",
          "four"
        ]
      ]
    }
  ],
  "word": "fol"
}

{
  "categories": [
    "Pages with 16 entries",
    "Pages with entries",
    "West Frisian adjectives",
    "West Frisian entries with incorrect language header",
    "West Frisian lemmas"
  ],
  "derived": [
    {
      "word": "folam"
    },
    {
      "word": "folüm"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "vo",
        "2": "en",
        "3": "four"
      },
      "expansion": "Borrowed from English four",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from English four.",
  "head_templates": [
    {
      "args": {
        "1": "vo",
        "2": "numeral"
      },
      "expansion": "fol",
      "name": "head"
    }
  ],
  "lang": "Volapük",
  "lang_code": "vo",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Pages with 16 entries",
        "Pages with entries",
        "Volapük cardinal numbers",
        "Volapük entries with incorrect language header",
        "Volapük lemmas",
        "Volapük numerals",
        "Volapük terms borrowed from English",
        "Volapük terms derived from English",
        "Volapük terms with quotations"
      ],
      "examples": [
        {
          "english": "Four times four is sixteen.",
          "ref": "1932, Arie de Jong, Leerboek der Wereldtaal, page 23:",
          "text": "Folna fol binos degmäl.",
          "type": "quote"
        }
      ],
      "glosses": [
        "four"
      ],
      "links": [
        [
          "four",
          "four"
        ]
      ]
    }
  ],
  "word": "fol"
}