"-ian" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Suffixes en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "suffix",
  "pos_title": "Suffixe",
  "senses": [
    {
      "glosses": [
        "-ien, terminaison qui forme des gentilés ou les adjectifs correspondants, à partir d’un nom propre."
      ],
      "id": "fr--ian-br-suffix-mcqMps61"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-ian"
}

{
  "categories": [
    "Suffixes en breton",
    "breton"
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "suffix",
  "pos_title": "Suffixe",
  "senses": [
    {
      "glosses": [
        "-ien, terminaison qui forme des gentilés ou les adjectifs correspondants, à partir d’un nom propre."
      ]
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-ian"
}