"trentaine" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "trente",
        "3": "-aine"
      },
      "expansion": "trente + -aine",
      "name": "af"
    }
  ],
  "etymology_text": "From trente + -aine.",
  "forms": [
    {
      "form": "trentaines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "trentaine f (plural trentaines)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French terms suffixed with -aine",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "about thirty"
      ],
      "id": "en-trentaine-fr-noun-pe8TALM0",
      "links": [
        [
          "thirty",
          "thirty"
        ]
      ],
      "related": [
        {
          "word": "centaine"
        },
        {
          "word": "cinquantaine"
        },
        {
          "word": "dizaine"
        },
        {
          "word": "douzaine"
        },
        {
          "word": "huitaine"
        },
        {
          "word": "quarantaine"
        },
        {
          "word": "quinzaine"
        },
        {
          "word": "soixantaine"
        },
        {
          "word": "vingtaine"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʁɑ̃.tɛn/"
    }
  ],
  "word": "trentaine"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "trente",
        "3": "-aine"
      },
      "expansion": "trente + -aine",
      "name": "af"
    }
  ],
  "etymology_text": "From trente + -aine.",
  "forms": [
    {
      "form": "trentaines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "trentaine f (plural trentaines)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "word": "centaine"
    },
    {
      "word": "cinquantaine"
    },
    {
      "word": "dizaine"
    },
    {
      "word": "douzaine"
    },
    {
      "word": "huitaine"
    },
    {
      "word": "quarantaine"
    },
    {
      "word": "quinzaine"
    },
    {
      "word": "soixantaine"
    },
    {
      "word": "vingtaine"
    }
  ],
  "senses": [
    {
      "categories": [
        "French 2-syllable words",
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French nouns",
        "French terms suffixed with -aine",
        "French terms with IPA pronunciation"
      ],
      "glosses": [
        "about thirty"
      ],
      "links": [
        [
          "thirty",
          "thirty"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʁɑ̃.tɛn/"
    }
  ],
  "word": "trentaine"
}