"58.º" meaning in Spanish

{
  "forms": [
    {
      "form": "58.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "58.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "58.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "58.ª",
        "fpl": "58.ªs",
        "mpl": "58.ºs"
      },
      "expansion": "58.º (feminine 58.ª, masculine plural 58.ºs, feminine plural 58.ªs)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "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": [
        "58th; abbreviation of quincuagésimo octavo"
      ],
      "id": "en-58.º-es-adj-ekqbQ6H9",
      "links": [
        [
          "58th",
          "58th"
        ],
        [
          "quincuagésimo octavo",
          "quincuagésimo octavo#Spanish"
        ]
      ]
    }
  ],
  "word": "58.º"
}

{
  "forms": [
    {
      "form": "58.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "58.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "58.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "58.ª",
        "fpl": "58.ªs",
        "mpl": "58.ºs"
      },
      "expansion": "58.º (feminine 58.ª, masculine plural 58.ºs, feminine plural 58.ªs)",
      "name": "es-adj"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "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": [
        "58th; abbreviation of quincuagésimo octavo"
      ],
      "links": [
        [
          "58th",
          "58th"
        ],
        [
          "quincuagésimo octavo",
          "quincuagésimo octavo#Spanish"
        ]
      ]
    }
  ],
  "word": "58.º"
}