"latviešu" meaning in Letton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en letton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Letton",
      "orig": "letton",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Letton",
  "lang_code": "lv",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "glosses": [
        "Génitif pluriel de latvietis."
      ],
      "id": "fr-latviešu-lv-noun-hDX9yZeS"
    },
    {
      "glosses": [
        "Génitif pluriel de latviete."
      ],
      "id": "fr-latviešu-lv-noun-bjBWxJz2"
    },
    {
      "form_of": [
        {
          "word": "valoda"
        }
      ],
      "glosses": [
        "(Ellipse de « 'latviešu valoda ») La langue lettonne, le letton."
      ],
      "id": "fr-latviešu-lv-noun-NGpK50cv"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "latviešu"
}

{
  "categories": [
    "Formes de noms communs en letton",
    "letton"
  ],
  "lang": "Letton",
  "lang_code": "lv",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "glosses": [
        "Génitif pluriel de latvietis."
      ]
    },
    {
      "glosses": [
        "Génitif pluriel de latviete."
      ]
    },
    {
      "form_of": [
        {
          "word": "valoda"
        }
      ],
      "glosses": [
        "(Ellipse de « 'latviešu valoda ») La langue lettonne, le letton."
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "latviešu"
}