"au sein de" meaning in French

{
  "head_templates": [
    {
      "args": {},
      "expansion": "au sein de",
      "name": "fr-prep"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prep",
  "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 prepositions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Yet in the midst of this poverty, he possessed and felt incredible riches of the heart, and an overabundance of a devouring genius.",
          "ref": "1831, Honoré de Balzac, Le Chef-d’œuvre inconnu, Part 1:",
          "text": "Au sein de cette misère, il possédait et ressentait d’incroyables richesses de cœur, et la surabondance d’un génie dévorant.",
          "type": "quote"
        }
      ],
      "glosses": [
        "within, inside, in the midst"
      ],
      "id": "en-au_sein_de-fr-prep-oJKZxfxf",
      "links": [
        [
          "within",
          "within"
        ],
        [
          "inside",
          "inside"
        ],
        [
          "in the midst",
          "in the midst"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/o sɛ̃ də/"
    }
  ],
  "word": "au sein de"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "au sein de",
      "name": "fr-prep"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French prepositions",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "english": "Yet in the midst of this poverty, he possessed and felt incredible riches of the heart, and an overabundance of a devouring genius.",
          "ref": "1831, Honoré de Balzac, Le Chef-d’œuvre inconnu, Part 1:",
          "text": "Au sein de cette misère, il possédait et ressentait d’incroyables richesses de cœur, et la surabondance d’un génie dévorant.",
          "type": "quote"
        }
      ],
      "glosses": [
        "within, inside, in the midst"
      ],
      "links": [
        [
          "within",
          "within"
        ],
        [
          "inside",
          "inside"
        ],
        [
          "in the midst",
          "in the midst"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/o sɛ̃ də/"
    }
  ],
  "word": "au sein de"
}