"45.º" meaning in Spanish

{
  "forms": [
    {
      "form": "45.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "45.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "45.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "45.ª",
        "fpl": "45.ªs",
        "mpl": "45.ºs"
      },
      "expansion": "45.º (feminine 45.ª, masculine plural 45.ºs, feminine plural 45.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": [
        "45th; abbreviation of cuadragésimo quinto"
      ],
      "id": "en-45.º-es-adj-r5gSA6Av",
      "links": [
        [
          "45th",
          "45th"
        ],
        [
          "cuadragésimo quinto",
          "cuadragésimo quinto#Spanish"
        ]
      ]
    }
  ],
  "word": "45.º"
}

{
  "forms": [
    {
      "form": "45.ª",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "45.ºs",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "45.ªs",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "f": "45.ª",
        "fpl": "45.ªs",
        "mpl": "45.ºs"
      },
      "expansion": "45.º (feminine 45.ª, masculine plural 45.ºs, feminine plural 45.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": [
        "45th; abbreviation of cuadragésimo quinto"
      ],
      "links": [
        [
          "45th",
          "45th"
        ],
        [
          "cuadragésimo quinto",
          "cuadragésimo quinto#Spanish"
        ]
      ]
    }
  ],
  "word": "45.º"
}