"costituitosi" meaning in Italien

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en italien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Italien",
      "orig": "italien",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Italien",
  "lang_code": "it",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "costituirsi"
        }
      ],
      "glosses": [
        "Participe passé de costituirsi."
      ],
      "id": "fr-costituitosi-it-verb-LJy6dbcv"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "costituitosi"
}

{
  "categories": [
    "Formes de verbes en italien",
    "italien"
  ],
  "lang": "Italien",
  "lang_code": "it",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "costituirsi"
        }
      ],
      "glosses": [
        "Participe passé de costituirsi."
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "costituitosi"
}