"εἰ" meaning in Grec ancien

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en grec ancien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Grec ancien",
      "orig": "grec ancien",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "raw_tags": [
        "crase de εἰ ἄν"
      ],
      "word": "ἐάν"
    },
    {
      "word": "εἰ γάρ"
    },
    {
      "raw_tags": [
        "expression d’un souhait ou d’un regret"
      ],
      "word": "εἴθε"
    },
    {
      "word": "εἰ δὲ μή"
    },
    {
      "word": "εἰ καί"
    },
    {
      "raw_tags": [
        "même si"
      ],
      "word": "καὶ εἰ"
    },
    {
      "word": "εἰ μή"
    },
    {
      "raw_tags": [
        "sauf, à moins que"
      ],
      "word": "εἰ μὴ ἄρα"
    },
    {
      "raw_tags": [
        "composé de εἰ et de τε"
      ],
      "word": "εἴτε"
    }
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "notes": [
    "Cette particule, tantôt adverbe, tantôt conjonction, est utilisée dans de nombreux cas. Voir aussi l'article consacré dans le Grand Bailly."
  ],
  "pos": "adv",
  "pos_title": "Adverbe",
  "raw_tags": [
    "εἰ invariable"
  ],
  "senses": [
    {
      "glosses": [
        "Si."
      ],
      "id": "fr-εἰ-grc-adv-7fZ~djwI"
    }
  ],
  "word": "εἰ"
}

{
  "categories": [
    "Adverbes en grec ancien",
    "grec ancien"
  ],
  "derived": [
    {
      "raw_tags": [
        "crase de εἰ ἄν"
      ],
      "word": "ἐάν"
    },
    {
      "word": "εἰ γάρ"
    },
    {
      "raw_tags": [
        "expression d’un souhait ou d’un regret"
      ],
      "word": "εἴθε"
    },
    {
      "word": "εἰ δὲ μή"
    },
    {
      "word": "εἰ καί"
    },
    {
      "raw_tags": [
        "même si"
      ],
      "word": "καὶ εἰ"
    },
    {
      "word": "εἰ μή"
    },
    {
      "raw_tags": [
        "sauf, à moins que"
      ],
      "word": "εἰ μὴ ἄρα"
    },
    {
      "raw_tags": [
        "composé de εἰ et de τε"
      ],
      "word": "εἴτε"
    }
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "notes": [
    "Cette particule, tantôt adverbe, tantôt conjonction, est utilisée dans de nombreux cas. Voir aussi l'article consacré dans le Grand Bailly."
  ],
  "pos": "adv",
  "pos_title": "Adverbe",
  "raw_tags": [
    "εἰ invariable"
  ],
  "senses": [
    {
      "glosses": [
        "Si."
      ]
    }
  ],
  "word": "εἰ"
}