"nein" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "neinboent"
    }
  ],
  "etymology_texts": [
    "Du vieux breton nin.",
    "À comparer avec les mots gallois et cornique nen (sens identique)."
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Faîte (d’un édifice)."
      ],
      "id": "fr-nein-br-noun-GXMWNtkG"
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en breton de la charpenterie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Panne faîtière."
      ],
      "id": "fr-nein-br-noun-OY9tosnm",
      "topics": [
        "carpentry"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈnɛjn\\"
    },
    {
      "ipa": "\\ˈnɛjn\\"
    }
  ],
  "tags": [
    "masculine",
    "plural"
  ],
  "word": "nein"
}

{
  "categories": [
    "Noms communs en breton",
    "breton"
  ],
  "derived": [
    {
      "word": "neinboent"
    }
  ],
  "etymology_texts": [
    "Du vieux breton nin.",
    "À comparer avec les mots gallois et cornique nen (sens identique)."
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Faîte (d’un édifice)."
      ]
    },
    {
      "categories": [
        "Lexique en breton de la charpenterie"
      ],
      "glosses": [
        "Panne faîtière."
      ],
      "topics": [
        "carpentry"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈnɛjn\\"
    },
    {
      "ipa": "\\ˈnɛjn\\"
    }
  ],
  "tags": [
    "masculine",
    "plural"
  ],
  "word": "nein"
}