"libre échange" meaning in French

{
  "forms": [
    {
      "form": "libres échanges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-",
        "3": "libres échanges"
      },
      "expansion": "libre échange m (usually uncountable, plural libres échanges)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "libre-échange"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative spelling of libre-échange"
      ],
      "id": "en-libre_échange-fr-noun-BZjiLQO1",
      "links": [
        [
          "libre-échange",
          "libre-échange#French"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine",
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/li.bʁ‿e.ʃɑ̃ʒ/"
    }
  ],
  "word": "libre échange"
}

{
  "forms": [
    {
      "form": "libres échanges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "-",
        "3": "libres échanges"
      },
      "expansion": "libre échange m (usually uncountable, plural libres échanges)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "libre-échange"
        }
      ],
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "French uncountable nouns"
      ],
      "glosses": [
        "Alternative spelling of libre-échange"
      ],
      "links": [
        [
          "libre-échange",
          "libre-échange#French"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "masculine",
        "uncountable",
        "usually"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/li.bʁ‿e.ʃɑ̃ʒ/"
    }
  ],
  "word": "libre échange"
}