"vão" meaning in Old Galician-Portuguese

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gl",
            "2": "van"
          },
          "expansion": "Galician: van",
          "name": "desc"
        }
      ],
      "text": "Galician: van"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pt",
            "2": "vão"
          },
          "expansion": "Portuguese: vão",
          "name": "desc"
        }
      ],
      "text": "Portuguese: vão"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "roa-opt",
        "2": "la",
        "3": "vānus",
        "4": "vānum"
      },
      "expansion": "Latin vānum",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin vānum.",
  "forms": [
    {
      "form": "vãos",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "vãa",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "vãas",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "roa-opt",
        "2": "adjective",
        "3": "plural",
        "4": "vãos",
        "5": "feminine",
        "6": "vãa",
        "7": "feminine plural",
        "8": "vãas",
        "g": "m"
      },
      "expansion": "vão m (plural vãos, feminine vãa, feminine plural vãas)",
      "name": "head"
    }
  ],
  "lang": "Old Galician-Portuguese",
  "lang_code": "roa-opt",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Galician-Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "7 7 16 3 27 7 6 1 1 1 5 2 16 3",
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "8 8 18 2 21 8 7 1 0 0 6 1 18 2",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "en vão"
        }
      ],
      "glosses": [
        "useless, ineffective"
      ],
      "id": "en-vão-roa-opt-adj-G0uWL8rf",
      "links": [
        [
          "useless",
          "useless"
        ],
        [
          "ineffective",
          "ineffective"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈβã.u/"
    }
  ],
  "word": "vão"
}

{
  "categories": [
    "Pages with 3 entries",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "en vão"
    }
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gl",
            "2": "van"
          },
          "expansion": "Galician: van",
          "name": "desc"
        }
      ],
      "text": "Galician: van"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pt",
            "2": "vão"
          },
          "expansion": "Portuguese: vão",
          "name": "desc"
        }
      ],
      "text": "Portuguese: vão"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "roa-opt",
        "2": "la",
        "3": "vānus",
        "4": "vānum"
      },
      "expansion": "Latin vānum",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin vānum.",
  "forms": [
    {
      "form": "vãos",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "vãa",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "vãas",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "roa-opt",
        "2": "adjective",
        "3": "plural",
        "4": "vãos",
        "5": "feminine",
        "6": "vãa",
        "7": "feminine plural",
        "8": "vãas",
        "g": "m"
      },
      "expansion": "vão m (plural vãos, feminine vãa, feminine plural vãas)",
      "name": "head"
    }
  ],
  "lang": "Old Galician-Portuguese",
  "lang_code": "roa-opt",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Old Galician-Portuguese adjectives",
        "Old Galician-Portuguese entries with incorrect language header",
        "Old Galician-Portuguese lemmas",
        "Old Galician-Portuguese terms derived from Latin",
        "Old Galician-Portuguese terms inherited from Latin",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "glosses": [
        "useless, ineffective"
      ],
      "links": [
        [
          "useless",
          "useless"
        ],
        [
          "ineffective",
          "ineffective"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈβã.u/"
    }
  ],
  "word": "vão"
}