"1ª" meaning in Catalan

{
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "primera",
        "3": "",
        "4": "first"
      },
      "expansion": "primera (“first”)",
      "name": "m"
    }
  ],
  "etymology_text": "Abbreviation of primera (“first”).",
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "adjective form"
      },
      "expansion": "1ª",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "1a"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Nonstandard form of 1a."
      ],
      "id": "en-1ª-ca-adj-XhyoKfg8",
      "links": [
        [
          "1a",
          "1a#Catalan"
        ]
      ],
      "raw_glosses": [
        "(proscribed) Nonstandard form of 1a."
      ],
      "synonyms": [
        {
          "word": "1a"
        },
        {
          "word": "primera"
        }
      ],
      "tags": [
        "alt-of",
        "nonstandard",
        "proscribed"
      ]
    }
  ],
  "word": "1ª"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "primera",
        "3": "",
        "4": "first"
      },
      "expansion": "primera (“first”)",
      "name": "m"
    }
  ],
  "etymology_text": "Abbreviation of primera (“first”).",
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "adjective form"
      },
      "expansion": "1ª",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "1a"
        }
      ],
      "categories": [
        "Catalan adjective forms",
        "Catalan entries with incorrect language header",
        "Catalan non-lemma forms",
        "Catalan nonstandard forms",
        "Catalan proscribed terms",
        "Catalan terms spelled with numbers",
        "Catalan terms spelled with ª"
      ],
      "glosses": [
        "Nonstandard form of 1a."
      ],
      "links": [
        [
          "1a",
          "1a#Catalan"
        ]
      ],
      "raw_glosses": [
        "(proscribed) Nonstandard form of 1a."
      ],
      "synonyms": [
        {
          "word": "1a"
        },
        {
          "word": "primera"
        }
      ],
      "tags": [
        "alt-of",
        "nonstandard",
        "proscribed"
      ]
    }
  ],
  "word": "1ª"
}