"elli birinci" meaning in Turkish

{
  "etymology_templates": [
    {
      "args": {
        "1": "tr",
        "2": "elli bir",
        "3": "-inci"
      },
      "expansion": "elli bir + -inci",
      "name": "suffix"
    }
  ],
  "etymology_text": "From elli bir + -inci.",
  "head_templates": [
    {
      "args": {
        "1": "tr",
        "2": "adjective"
      },
      "expansion": "elli birinci",
      "name": "head"
    }
  ],
  "lang": "Turkish",
  "lang_code": "tr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Turkish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Turkish ordinal numbers",
          "parents": [
            "Ordinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Turkish terms suffixed with -inci",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "fifty-first"
      ],
      "id": "en-elli_birinci-tr-adj-WCSmsXSD",
      "links": [
        [
          "fifty-first",
          "fifty-first"
        ]
      ],
      "synonyms": [
        {
          "word": "51'inci"
        },
        {
          "word": "51."
        }
      ]
    }
  ],
  "word": "elli birinci"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "tr",
        "2": "elli bir",
        "3": "-inci"
      },
      "expansion": "elli bir + -inci",
      "name": "suffix"
    }
  ],
  "etymology_text": "From elli bir + -inci.",
  "head_templates": [
    {
      "args": {
        "1": "tr",
        "2": "adjective"
      },
      "expansion": "elli birinci",
      "name": "head"
    }
  ],
  "lang": "Turkish",
  "lang_code": "tr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Turkish adjectives",
        "Turkish entries with incorrect language header",
        "Turkish lemmas",
        "Turkish multiword terms",
        "Turkish ordinal numbers",
        "Turkish terms suffixed with -inci"
      ],
      "glosses": [
        "fifty-first"
      ],
      "links": [
        [
          "fifty-first",
          "fifty-first"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "51'inci"
    },
    {
      "word": "51."
    }
  ],
  "word": "elli birinci"
}