"langue sœur" meaning in Français

{
  "anagrams": [
    {
      "word": "eurolangues"
    },
    {
      "word": "langoureuse"
    },
    {
      "word": "Nogueruelas"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en italien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Œ en français",
      "orig": "œ en français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "langues sœurs",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "word": "langue mère"
    },
    {
      "word": "langue fille"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en français de la linguistique",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Langue issue de la même langue mère qu’une autre langue."
      ],
      "id": "fr-langue_sœur-fr-noun-W~TjzA53",
      "topics": [
        "linguistic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\lɑ̃ɡ.søʁ\\"
    }
  ],
  "tags": [
    "feminine"
  ],
  "translations": [
    {
      "lang": "Italien",
      "lang_code": "it",
      "tags": [
        "feminine"
      ],
      "word": "lingua sorella"
    }
  ],
  "word": "langue sœur"
}

{
  "anagrams": [
    {
      "word": "eurolangues"
    },
    {
      "word": "langoureuse"
    },
    {
      "word": "Nogueruelas"
    }
  ],
  "categories": [
    "Locutions nominales en français",
    "Traductions en italien",
    "français",
    "œ en français"
  ],
  "forms": [
    {
      "form": "langues sœurs",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "word": "langue mère"
    },
    {
      "word": "langue fille"
    }
  ],
  "senses": [
    {
      "categories": [
        "Lexique en français de la linguistique",
        "Wiktionnaire:Exemples manquants en français"
      ],
      "glosses": [
        "Langue issue de la même langue mère qu’une autre langue."
      ],
      "topics": [
        "linguistic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\lɑ̃ɡ.søʁ\\"
    }
  ],
  "tags": [
    "feminine"
  ],
  "translations": [
    {
      "lang": "Italien",
      "lang_code": "it",
      "tags": [
        "feminine"
      ],
      "word": "lingua sorella"
    }
  ],
  "word": "langue sœur"
}