"páťák" meaning in Czech

{
  "etymology_templates": [
    {
      "args": {
        "1": "cs",
        "2": "pátý",
        "3": "ák"
      },
      "expansion": "pátý + -ák",
      "name": "suffix"
    }
  ],
  "etymology_text": "From pátý + -ák.",
  "head_templates": [
    {
      "args": {
        "1": "m-an"
      },
      "expansion": "páťák m anim",
      "name": "cs-noun"
    }
  ],
  "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"
        },
        {
          "kind": "other",
          "name": "Czech terms suffixed with -ák",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cs",
          "name": "Children",
          "orig": "cs:Children",
          "parents": [
            "Youth",
            "Age",
            "People",
            "Human",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cs",
          "name": "Education",
          "orig": "cs:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "cs",
          "name": "Five",
          "orig": "cs:Five",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a fifth grader"
      ],
      "id": "en-páťák-cs-noun-90KYV0UI",
      "links": [
        [
          "fifth",
          "fifth"
        ],
        [
          "grader",
          "grader"
        ]
      ],
      "raw_glosses": [
        "(informal) a fifth grader"
      ],
      "tags": [
        "animate",
        "informal",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpaːcaːk]"
    }
  ],
  "word": "páťák"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cs",
        "2": "pátý",
        "3": "ák"
      },
      "expansion": "pátý + -ák",
      "name": "suffix"
    }
  ],
  "etymology_text": "From pátý + -ák.",
  "head_templates": [
    {
      "args": {
        "1": "m-an"
      },
      "expansion": "páťák m anim",
      "name": "cs-noun"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Czech animate nouns",
        "Czech entries with incorrect language header",
        "Czech informal terms",
        "Czech lemmas",
        "Czech masculine nouns",
        "Czech nouns",
        "Czech terms suffixed with -ák",
        "Czech terms with IPA pronunciation",
        "cs:Children",
        "cs:Education",
        "cs:Five"
      ],
      "glosses": [
        "a fifth grader"
      ],
      "links": [
        [
          "fifth",
          "fifth"
        ],
        [
          "grader",
          "grader"
        ]
      ],
      "raw_glosses": [
        "(informal) a fifth grader"
      ],
      "tags": [
        "animate",
        "informal",
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈpaːcaːk]"
    }
  ],
  "word": "páťák"
}