"le sien" meaning in French

{
  "forms": [
    {
      "form": "la sienne",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "les siens",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "les siennes",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "f": "la sienne",
        "fp": "les siennes",
        "mp": "les siens"
      },
      "expansion": "le sien m (feminine la sienne, masculine plural les siens, feminine plural les siennes)",
      "name": "fr-pron"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "pron",
  "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 possessive pronouns",
          "parents": [
            "Possessive pronouns",
            "Pronouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French pronouns",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "I didn't have a pencil, so Paul lent me his.",
          "text": "Je n’avais pas de crayon, alors Paul m’a prêté le sien.",
          "type": "example"
        },
        {
          "english": "I didn't have a pencil, so Marie lent me hers.",
          "text": "Je n’avais pas de crayon, alors Marie m’a prêté le sien.",
          "type": "example"
        }
      ],
      "glosses": [
        "his; hers; its"
      ],
      "id": "en-le_sien-fr-pron-wnngsE1Q",
      "links": [
        [
          "his",
          "his"
        ],
        [
          "hers",
          "hers"
        ],
        [
          "its",
          "its"
        ]
      ],
      "related": [
        {
          "word": "le mien"
        },
        {
          "word": "la mienne"
        },
        {
          "word": "les miens"
        },
        {
          "word": "les miennes"
        },
        {
          "word": "le tien"
        },
        {
          "word": "la tienne"
        },
        {
          "word": "les tiens"
        },
        {
          "word": "les tiennes"
        },
        {
          "word": "la sienne"
        },
        {
          "word": "les siens"
        },
        {
          "word": "les siennes"
        },
        {
          "word": "le nôtre"
        },
        {
          "word": "la nôtre"
        },
        {
          "word": "les nôtres"
        },
        {
          "word": "le vôtre"
        },
        {
          "word": "la vôtre"
        },
        {
          "word": "les vôtres"
        },
        {
          "word": "le leur"
        },
        {
          "word": "la leur"
        },
        {
          "word": "les leurs"
        },
        {
          "word": "son"
        },
        {
          "word": "sa"
        },
        {
          "word": "ses"
        }
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lə sjɛ̃/"
    }
  ],
  "word": "le sien"
}

{
  "forms": [
    {
      "form": "la sienne",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "les siens",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "les siennes",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "f": "la sienne",
        "fp": "les siennes",
        "mp": "les siens"
      },
      "expansion": "le sien m (feminine la sienne, masculine plural les siens, feminine plural les siennes)",
      "name": "fr-pron"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "pron",
  "related": [
    {
      "word": "le mien"
    },
    {
      "word": "la mienne"
    },
    {
      "word": "les miens"
    },
    {
      "word": "les miennes"
    },
    {
      "word": "le tien"
    },
    {
      "word": "la tienne"
    },
    {
      "word": "les tiens"
    },
    {
      "word": "les tiennes"
    },
    {
      "word": "la sienne"
    },
    {
      "word": "les siens"
    },
    {
      "word": "les siennes"
    },
    {
      "word": "le nôtre"
    },
    {
      "word": "la nôtre"
    },
    {
      "word": "les nôtres"
    },
    {
      "word": "le vôtre"
    },
    {
      "word": "la vôtre"
    },
    {
      "word": "les vôtres"
    },
    {
      "word": "le leur"
    },
    {
      "word": "la leur"
    },
    {
      "word": "les leurs"
    },
    {
      "word": "son"
    },
    {
      "word": "sa"
    },
    {
      "word": "ses"
    }
  ],
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French possessive pronouns",
        "French pronouns",
        "French terms with IPA pronunciation",
        "French terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "I didn't have a pencil, so Paul lent me his.",
          "text": "Je n’avais pas de crayon, alors Paul m’a prêté le sien.",
          "type": "example"
        },
        {
          "english": "I didn't have a pencil, so Marie lent me hers.",
          "text": "Je n’avais pas de crayon, alors Marie m’a prêté le sien.",
          "type": "example"
        }
      ],
      "glosses": [
        "his; hers; its"
      ],
      "links": [
        [
          "his",
          "his"
        ],
        [
          "hers",
          "hers"
        ],
        [
          "its",
          "its"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lə sjɛ̃/"
    }
  ],
  "word": "le sien"
}