"51st" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "51st (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "fifty-first"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "name": "Terms with Afrikaans translations",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "name": "Terms with Manchu translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of fifty-first."
      ],
      "id": "en-51st-en-adj-MjEd~C5k",
      "links": [
        [
          "fifty-first",
          "fifty-first#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "not-comparable"
      ],
      "translations": [
        {
          "code": "af",
          "lang": "Afrikaans",
          "sense": "abbreviation of fifty-first — see also fifty-first",
          "word": "51ste"
        },
        {
          "code": "mnc",
          "lang": "Manchu",
          "roman": "51 ci",
          "sense": "abbreviation of fifty-first — see also fifty-first",
          "word": "51 ᠴᡳ"
        }
      ]
    }
  ],
  "word": "51st"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "51st (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "fifty-first"
        }
      ],
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        "English abbreviations",
        "English adjectives",
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        "English lemmas",
        "English terms spelled with numbers",
        "English uncomparable adjectives",
        "English words without vowels",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Afrikaans translations",
        "Terms with Manchu translations"
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      "glosses": [
        "Abbreviation of fifty-first."
      ],
      "links": [
        [
          "fifty-first",
          "fifty-first#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "not-comparable"
      ]
    }
  ],
  "translations": [
    {
      "code": "af",
      "lang": "Afrikaans",
      "sense": "abbreviation of fifty-first — see also fifty-first",
      "word": "51ste"
    },
    {
      "code": "mnc",
      "lang": "Manchu",
      "roman": "51 ci",
      "sense": "abbreviation of fifty-first — see also fifty-first",
      "word": "51 ᠴᡳ"
    }
  ],
  "word": "51st"
}