"2ᵈ" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "2ᵈ (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "2nd"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Obsolete form of 2nd."
      ],
      "id": "en-2ᵈ-en-adj-PdPz2ca9",
      "links": [
        [
          "2nd",
          "2nd#English"
        ]
      ],
      "tags": [
        "alt-of",
        "not-comparable",
        "obsolete"
      ]
    }
  ],
  "word": "2ᵈ"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "2ᵈ (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "2nd"
        }
      ],
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English obsolete forms",
        "English terms spelled with numbers",
        "English terms spelled with ᵈ",
        "English uncomparable adjectives",
        "English words without vowels"
      ],
      "glosses": [
        "Obsolete form of 2nd."
      ],
      "links": [
        [
          "2nd",
          "2nd#English"
        ]
      ],
      "tags": [
        "alt-of",
        "not-comparable",
        "obsolete"
      ]
    }
  ],
  "word": "2ᵈ"
}