"39.º" meaning in Spanish

{
  "forms": [
    {
      "form": "39.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "39.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "39.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "39.ª",
        "fpl": "39.ªs",
        "mpl": "39.ºs"
      },
      "expansion": "39.º (feminine 39.ª, masculine plural 39.ºs, feminine plural 39.ªs)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "39th; abbreviation of trigésimo noveno"
      ],
      "id": "en-39.º-es-adj-tO7Srtkv",
      "links": [
        [
          "39th",
          "39th"
        ],
        [
          "trigésimo noveno",
          "trigésimo noveno#Spanish"
        ]
      ]
    }
  ],
  "word": "39.º"
}

{
  "forms": [
    {
      "form": "39.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "39.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "39.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "39.ª",
        "fpl": "39.ªs",
        "mpl": "39.ºs"
      },
      "expansion": "39.º (feminine 39.ª, masculine plural 39.ºs, feminine plural 39.ªs)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Spanish abbreviations",
        "Spanish adjectives",
        "Spanish adjectives with red links in their headword lines",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish links with redundant alt parameters",
        "Spanish terms spelled with .",
        "Spanish terms spelled with numbers",
        "Spanish terms spelled with º"
      ],
      "glosses": [
        "39th; abbreviation of trigésimo noveno"
      ],
      "links": [
        [
          "39th",
          "39th"
        ],
        [
          "trigésimo noveno",
          "trigésimo noveno#Spanish"
        ]
      ]
    }
  ],
  "word": "39.º"
}