"therein" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "herein"
    },
    {
      "word": "thereof"
    },
    {
      "word": "wherein"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Termes littéraires en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "God created the Earth, and all things therein.",
          "translation": "Dieu créa la Terre, et tout ce qui s’y trouve."
        }
      ],
      "glosses": [
        "Là-dedans, dedans."
      ],
      "id": "fr-therein-en-adv-rjSjF1kg",
      "tags": [
        "literary"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-us-therein.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/61/En-us-therein.ogg/En-us-therein.ogg.mp3",
      "ogg_url": "https://commons.wikimedia.org/wiki/Special:FilePath/En-us-therein.ogg",
      "raw_tags": [
        "États-Unis"
      ]
    }
  ],
  "word": "therein"
}

{
  "categories": [
    "Adverbes en anglais",
    "Lemmes en anglais",
    "anglais"
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "word": "herein"
    },
    {
      "word": "thereof"
    },
    {
      "word": "wherein"
    }
  ],
  "senses": [
    {
      "categories": [
        "Exemples en anglais",
        "Termes littéraires en anglais"
      ],
      "examples": [
        {
          "text": "God created the Earth, and all things therein.",
          "translation": "Dieu créa la Terre, et tout ce qui s’y trouve."
        }
      ],
      "glosses": [
        "Là-dedans, dedans."
      ],
      "tags": [
        "literary"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-us-therein.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/61/En-us-therein.ogg/En-us-therein.ogg.mp3",
      "ogg_url": "https://commons.wikimedia.org/wiki/Special:FilePath/En-us-therein.ogg",
      "raw_tags": [
        "États-Unis"
      ]
    }
  ],
  "word": "therein"
}