"Ostfalen" meaning in Allemand

{
  "antonyms": [
    {
      "word": "Westfalen"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Noms propres en allemand",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Allemand",
      "orig": "allemand",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Étymologies en allemand incluant une reconstruction",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de Ost et de *Falen (« plaine »), apparenté à Fläche, au slavon поле, pole (« champ, plaine »)."
  ],
  "lang": "Allemand",
  "lang_code": "de",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Régions d’Allemagne en allemand",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en allemand",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Ostphalie, partie de la Saxe à l'est du Weser."
      ],
      "id": "fr-Ostfalen-de-name-yzWeKuTH",
      "raw_tags": [
        "Toponyme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɔstˈfaːlən\\"
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Ostfalen"
}

{
  "antonyms": [
    {
      "word": "Westfalen"
    }
  ],
  "categories": [
    "Noms propres en allemand",
    "allemand",
    "Étymologies en allemand incluant une reconstruction"
  ],
  "etymology_texts": [
    "Composé de Ost et de *Falen (« plaine »), apparenté à Fläche, au slavon поле, pole (« champ, plaine »)."
  ],
  "lang": "Allemand",
  "lang_code": "de",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "categories": [
        "Régions d’Allemagne en allemand",
        "Wiktionnaire:Exemples manquants en allemand"
      ],
      "glosses": [
        "Ostphalie, partie de la Saxe à l'est du Weser."
      ],
      "raw_tags": [
        "Toponyme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ɔstˈfaːlən\\"
    }
  ],
  "tags": [
    "neuter"
  ],
  "word": "Ostfalen"
}