"1º" meaning in Portuguese

{
  "forms": [
    {
      "form": "1ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "1ᵒˢ",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "1ᵃˢ",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "fpl": "1ᵃˢ",
        "hascomp": "no",
        "mpl": "1ᵒˢ"
      },
      "expansion": "1º (feminine 1ª, masculine plural 1ᵒˢ, feminine plural 1ᵃˢ, not comparable)",
      "name": "pt-adj"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "1.º"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Portuguese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of 1.º"
      ],
      "id": "en-1º-pt-adj-kmRkdEe1",
      "links": [
        [
          "1.º",
          "1.º#Portuguese"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "not-comparable",
        "proscribed"
      ]
    }
  ],
  "word": "1º"
}

{
  "forms": [
    {
      "form": "1ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "1ᵒˢ",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "1ᵃˢ",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "fpl": "1ᵃˢ",
        "hascomp": "no",
        "mpl": "1ᵒˢ"
      },
      "expansion": "1º (feminine 1ª, masculine plural 1ᵒˢ, feminine plural 1ᵃˢ, not comparable)",
      "name": "pt-adj"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "1.º"
        }
      ],
      "categories": [
        "Portuguese adjectives",
        "Portuguese entries with incorrect language header",
        "Portuguese lemmas",
        "Portuguese links with redundant wikilinks",
        "Portuguese proscribed terms",
        "Portuguese terms spelled with numbers",
        "Portuguese terms spelled with º",
        "Portuguese uncomparable adjectives"
      ],
      "glosses": [
        "Alternative form of 1.º"
      ],
      "links": [
        [
          "1.º",
          "1.º#Portuguese"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "not-comparable",
        "proscribed"
      ]
    }
  ],
  "word": "1º"
}