"firstlight" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Dates manquantes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    " ",
    "(Date à préciser)Composé de first (« premier ») et de light (« lumière »), littéralement « première lumière »."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "first light"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Noms indénombrables en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Variante de first light."
      ],
      "id": "fr-firstlight-en-noun-0UwAfj3X",
      "tags": [
        "alt-of",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈfɜːst.ˌlaɪt\\"
    }
  ],
  "word": "firstlight"
}

{
  "categories": [
    "Compositions en anglais",
    "Dates manquantes en anglais",
    "Lemmes en anglais",
    "Noms communs en anglais",
    "anglais"
  ],
  "etymology_texts": [
    " ",
    "(Date à préciser)Composé de first (« premier ») et de light (« lumière »), littéralement « première lumière »."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "first light"
        }
      ],
      "categories": [
        "Noms indénombrables en anglais",
        "Wiktionnaire:Exemples manquants en anglais"
      ],
      "glosses": [
        "Variante de first light."
      ],
      "tags": [
        "alt-of",
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈfɜːst.ˌlaɪt\\"
    }
  ],
  "word": "firstlight"
}