"пятой" meaning in Russian

{
  "etymology_number": 1,
  "forms": [
    {
      "form": "пято́й",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "pjatój",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in",
        "head": "пято́й"
      },
      "expansion": "пято́й • (pjatój) f inan",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "56 44",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "extra": "pjatá",
          "word": "пята́"
        }
      ],
      "glosses": [
        "instrumental singular of пята́ (pjatá)"
      ],
      "id": "en-пятой-ru-noun-vdGLK05P",
      "links": [
        [
          "пята́",
          "пята#Russian"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pʲɪˈtoj]"
    }
  ],
  "word": "пятой"
}

{
  "etymology_number": 2,
  "forms": [
    {
      "form": "пя́той",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "pjátoj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in",
        "head": "пя́той"
      },
      "expansion": "пя́той • (pjátoj) f inan",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "55 45",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "extra": "pjátaja",
          "word": "пя́тая"
        }
      ],
      "glosses": [
        "genitive/dative/instrumental/prepositional singular of пя́тая (pjátaja)"
      ],
      "id": "en-пятой-ru-noun-RM2oSFSP",
      "links": [
        [
          "пя́тая",
          "пятая#Russian"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "genitive",
        "instrumental",
        "prepositional",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpʲatəj]"
    }
  ],
  "word": "пятой"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Russian 2-syllable words",
    "Russian entries with incorrect language header",
    "Russian non-lemma forms",
    "Russian noun forms",
    "Russian terms with IPA pronunciation"
  ],
  "etymology_number": 1,
  "forms": [
    {
      "form": "пято́й",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "pjatój",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in",
        "head": "пято́й"
      },
      "expansion": "пято́й • (pjatój) f inan",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "extra": "pjatá",
          "word": "пята́"
        }
      ],
      "glosses": [
        "instrumental singular of пята́ (pjatá)"
      ],
      "links": [
        [
          "пята́",
          "пята#Russian"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pʲɪˈtoj]"
    }
  ],
  "word": "пятой"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Russian 2-syllable words",
    "Russian entries with incorrect language header",
    "Russian non-lemma forms",
    "Russian noun forms",
    "Russian terms with IPA pronunciation"
  ],
  "etymology_number": 2,
  "forms": [
    {
      "form": "пя́той",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "pjátoj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "noun form",
        "g": "f-in",
        "head": "пя́той"
      },
      "expansion": "пя́той • (pjátoj) f inan",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "form_of": [
        {
          "extra": "pjátaja",
          "word": "пя́тая"
        }
      ],
      "glosses": [
        "genitive/dative/instrumental/prepositional singular of пя́тая (pjátaja)"
      ],
      "links": [
        [
          "пя́тая",
          "пятая#Russian"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "genitive",
        "instrumental",
        "prepositional",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpʲatəj]"
    }
  ],
  "word": "пятой"
}