"οι" meaning in Grec

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes d’articles définis en grec",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Grec",
      "orig": "grec",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Grec",
  "lang_code": "el",
  "pos": "article",
  "pos_title": "Forme d’article défini",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en grec",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "ο"
        }
      ],
      "glosses": [
        "Nominatif pluriel de ο."
      ],
      "id": "fr-οι-el-article-JieFi9bR"
    }
  ],
  "sounds": [
    {
      "ipa": "\\i\\"
    }
  ],
  "tags": [
    "definite",
    "form-of",
    "masculine",
    "plural"
  ],
  "word": "οι"
}

{
  "categories": [
    "Formes d’articles définis en grec",
    "grec"
  ],
  "lang": "Grec",
  "lang_code": "el",
  "pos": "article",
  "pos_title": "Forme d’article défini",
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en grec"
      ],
      "form_of": [
        {
          "word": "ο"
        }
      ],
      "glosses": [
        "Nominatif pluriel de ο."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\i\\"
    }
  ],
  "tags": [
    "definite",
    "form-of",
    "masculine",
    "plural"
  ],
  "word": "οι"
}