"πρώην" 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": [
    {
      "lang": "Grec",
      "lang_code": "el",
      "word": "πρώην"
    }
  ],
  "etymology_texts": [
    "De πρό, pró (« avant ») ; voir πρῶτος, prôtos."
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "pos": "adv",
  "pos_title": "Adverbe",
  "raw_tags": [
    "πρώην, prôên"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en grec ancien",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Avant."
      ],
      "id": "fr-πρώην-grc-adv-6qzTyNXk"
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en grec ancien",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Avant-hier."
      ],
      "id": "fr-πρώην-grc-adv-SmQ~Pf~b",
      "raw_tags": [
        "Sens spécifique"
      ]
    }
  ],
  "word": "πρώην"
}

{
  "categories": [
    "Adverbes en grec ancien",
    "grec ancien"
  ],
  "derived": [
    {
      "lang": "Grec",
      "lang_code": "el",
      "word": "πρώην"
    }
  ],
  "etymology_texts": [
    "De πρό, pró (« avant ») ; voir πρῶτος, prôtos."
  ],
  "lang": "Grec ancien",
  "lang_code": "grc",
  "pos": "adv",
  "pos_title": "Adverbe",
  "raw_tags": [
    "πρώην, prôên"
  ],
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en grec ancien"
      ],
      "glosses": [
        "Avant."
      ]
    },
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en grec ancien"
      ],
      "glosses": [
        "Avant-hier."
      ],
      "raw_tags": [
        "Sens spécifique"
      ]
    }
  ],
  "word": "πρώην"
}