"lettre de voiture" meaning in French

{
  "forms": [
    {
      "form": "lettres de voiture",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "lettre de voiture f (plural lettres de voiture)",
      "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": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Commercial documents",
          "orig": "fr:Commercial documents",
          "parents": [
            "Commerce",
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "waybill"
      ],
      "id": "en-lettre_de_voiture-fr-noun-zjMDvKDa",
      "links": [
        [
          "waybill",
          "waybill"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lɛ.tʁə də vwa.tyʁ/"
    }
  ],
  "word": "lettre de voiture"
}

{
  "forms": [
    {
      "form": "lettres de voiture",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "lettre de voiture f (plural lettres de voiture)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French terms with IPA pronunciation",
        "Pages with 2 entries",
        "Pages with entries",
        "fr:Commercial documents"
      ],
      "glosses": [
        "waybill"
      ],
      "links": [
        [
          "waybill",
          "waybill"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lɛ.tʁə də vwa.tyʁ/"
    }
  ],
  "word": "lettre de voiture"
}