"septantaines" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Français de Belgique",
          "orig": "français de Belgique",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Français de Suisse",
          "orig": "français de Suisse",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "septantaine"
        }
      ],
      "glosses": [
        "Pluriel de septantaine."
      ],
      "id": "fr-septantaines-fr-noun-wRa11EOf",
      "raw_tags": [
        "Belgique",
        "Suisse"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sɛp.tɑ̃.tɛn\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "septantaines"
}

{
  "categories": [
    "Formes de noms communs en français",
    "français"
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        "français de Belgique",
        "français de Suisse"
      ],
      "form_of": [
        {
          "word": "septantaine"
        }
      ],
      "glosses": [
        "Pluriel de septantaine."
      ],
      "raw_tags": [
        "Belgique",
        "Suisse"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sɛp.tɑ̃.tɛn\\"
    }
  ],
  "tags": [
    "feminine",
    "form-of"
  ],
  "word": "septantaines"
}