"thứ 7" meaning in Vietnamien

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en vietnamien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vietnamien",
      "orig": "vietnamien",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "thứ bảy"
        }
      ],
      "glosses": [
        "Variante orthographique de thứ bảy."
      ],
      "id": "fr-thứ_7-vi-noun-0MCB5mSI",
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "thứ 7"
}

{
  "categories": [
    "Noms communs en vietnamien",
    "vietnamien"
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "thứ bảy"
        }
      ],
      "glosses": [
        "Variante orthographique de thứ bảy."
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "word": "thứ 7"
}