"četrtak" meaning in Serbo-Croatian

{
  "forms": [
    {
      "form": "четртак",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "m"
      },
      "expansion": "četrtak m (Cyrillic spelling четртак)",
      "name": "sh-noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Chakavian Serbo-Croatian",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Serbo-Croatian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sh",
          "name": "Days of the week",
          "orig": "sh:Days of the week",
          "parents": [
            "Periodic occurrences",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Thursday"
      ],
      "id": "en-četrtak-sh-noun-~CZiBi~9",
      "links": [
        [
          "Thursday",
          "Thursday"
        ]
      ],
      "raw_glosses": [
        "(Chakavian) Thursday"
      ],
      "synonyms": [
        {
          "roman": "Shtokavian",
          "word": "četvŕtak"
        }
      ],
      "tags": [
        "Chakavian",
        "masculine"
      ]
    }
  ],
  "word": "četrtak"
}

{
  "forms": [
    {
      "form": "четртак",
      "tags": [
        "Cyrillic"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "g": "m"
      },
      "expansion": "četrtak m (Cyrillic spelling четртак)",
      "name": "sh-noun"
    }
  ],
  "lang": "Serbo-Croatian",
  "lang_code": "sh",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Chakavian Serbo-Croatian",
        "Pages with 2 entries",
        "Serbo-Croatian entries with incorrect language header",
        "Serbo-Croatian lemmas",
        "Serbo-Croatian masculine nouns",
        "Serbo-Croatian nouns",
        "sh:Days of the week"
      ],
      "glosses": [
        "Thursday"
      ],
      "links": [
        [
          "Thursday",
          "Thursday"
        ]
      ],
      "raw_glosses": [
        "(Chakavian) Thursday"
      ],
      "tags": [
        "Chakavian",
        "masculine"
      ]
    }
  ],
  "synonyms": [
    {
      "roman": "Shtokavian",
      "word": "četvŕtak"
    }
  ],
  "word": "četrtak"
}