"εἴεν" meaning in Grec ancien

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en grec ancien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Grec ancien",
      "orig": "grec ancien",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "raw_tags": [
    "εἴεν"
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "εἰμί"
        }
      ],
      "glosses": [
        "Optatif présent, 3ᵉ personne du pluriel, d’εἰμί."
      ],
      "id": "fr-εἴεν-grc-verb-wtP0Zl9w"
    }
  ],
  "tags": [
    "conjugation",
    "form-of"
  ],
  "word": "εἴεν"
}

{
  "categories": [
    "Formes de verbes en grec ancien",
    "grec ancien"
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "raw_tags": [
    "εἴεν"
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "εἰμί"
        }
      ],
      "glosses": [
        "Optatif présent, 3ᵉ personne du pluriel, d’εἰμί."
      ]
    }
  ],
  "tags": [
    "conjugation",
    "form-of"
  ],
  "word": "εἴεν"
}