"au leur" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Pronoms possessifs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "De l’article défini au et de l’adjectif leur."
  ],
  "forms": [
    {
      "form": ":Modèle:! aux leurs",
      "ipas": [
        "\\o lœʁ\\",
        "\\o lœʁ\\"
      ],
      "tags": [
        "singular",
        "masculine"
      ]
    },
    {
      "form": "à la leur",
      "ipas": [
        "\\a la lœʁ\\"
      ],
      "tags": [
        "singular",
        "feminine"
      ]
    },
    {
      "form": "aux leurs",
      "ipas": [
        "\\o lœʁ\\"
      ],
      "tags": [
        "plural",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "pron",
  "pos_title": "Pronom possessif",
  "senses": [
    {
      "glosses": [
        "Possessif de la troisième personne du pluriel au masculin singulier."
      ],
      "id": "fr-au_leur-fr-pron-~rMS~WM2"
    }
  ],
  "sounds": [
    {
      "ipa": "\\o lœʁ\\"
    }
  ],
  "tags": [
    "possessive"
  ],
  "word": "au leur"
}

{
  "categories": [
    "Pronoms possessifs en français",
    "français"
  ],
  "etymology_texts": [
    "De l’article défini au et de l’adjectif leur."
  ],
  "forms": [
    {
      "form": ":Modèle:! aux leurs",
      "ipas": [
        "\\o lœʁ\\",
        "\\o lœʁ\\"
      ],
      "tags": [
        "singular",
        "masculine"
      ]
    },
    {
      "form": "à la leur",
      "ipas": [
        "\\a la lœʁ\\"
      ],
      "tags": [
        "singular",
        "feminine"
      ]
    },
    {
      "form": "aux leurs",
      "ipas": [
        "\\o lœʁ\\"
      ],
      "tags": [
        "plural",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "pron",
  "pos_title": "Pronom possessif",
  "senses": [
    {
      "glosses": [
        "Possessif de la troisième personne du pluriel au masculin singulier."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\o lœʁ\\"
    }
  ],
  "tags": [
    "possessive"
  ],
  "word": "au leur"
}