"première pierre" meaning in French

{
  "forms": [
    {
      "form": "premières pierres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "première pierre f (plural premières pierres)",
      "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 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Architecture",
          "orig": "fr:Architecture",
          "parents": [
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "to lay the first stone",
          "text": "poser la première pierre",
          "type": "example"
        }
      ],
      "glosses": [
        "foundation stone"
      ],
      "id": "en-première_pierre-fr-noun-z7xDm~6N",
      "links": [
        [
          "architecture",
          "architecture"
        ],
        [
          "foundation stone",
          "foundation stone"
        ]
      ],
      "raw_glosses": [
        "(architecture) foundation stone"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "architecture"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʁə.mjɛʁ pjɛʁ/"
    }
  ],
  "word": "première pierre"
}

{
  "forms": [
    {
      "form": "premières pierres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "première pierre f (plural premières pierres)",
      "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",
        "French terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Architecture"
      ],
      "examples": [
        {
          "english": "to lay the first stone",
          "text": "poser la première pierre",
          "type": "example"
        }
      ],
      "glosses": [
        "foundation stone"
      ],
      "links": [
        [
          "architecture",
          "architecture"
        ],
        [
          "foundation stone",
          "foundation stone"
        ]
      ],
      "raw_glosses": [
        "(architecture) foundation stone"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "architecture"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʁə.mjɛʁ pjɛʁ/"
    }
  ],
  "word": "première pierre"
}