"pětkami" meaning in Czech

{
  "head_templates": [
    {
      "args": {
        "1": "cs",
        "2": "noun form"
      },
      "expansion": "pětkami",
      "name": "head"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "59 21 21",
          "kind": "other",
          "name": "Lower Sorbian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "word": "pětka"
        }
      ],
      "glosses": [
        "instrumental plural of pětka"
      ],
      "id": "en-pětkami-cs-noun-p~8XFzoG",
      "links": [
        [
          "pětka",
          "pětka#Czech"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpjɛtkamɪ]"
    }
  ],
  "word": "pětkami"
}

{
  "categories": [
    "Lower Sorbian entries with incorrect language header",
    "Lower Sorbian non-lemma forms",
    "Lower Sorbian noun forms",
    "Lower Sorbian terms with IPA pronunciation"
  ],
  "head_templates": [
    {
      "args": {
        "1": "cs",
        "2": "noun form"
      },
      "expansion": "pětkami",
      "name": "head"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Czech entries with incorrect language header",
        "Czech non-lemma forms",
        "Czech noun forms",
        "Czech terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "word": "pětka"
        }
      ],
      "glosses": [
        "instrumental plural of pětka"
      ],
      "links": [
        [
          "pětka",
          "pětka#Czech"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpjɛtkamɪ]"
    }
  ],
  "word": "pětkami"
}