"at the first" meaning in English

{
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "alt_of": [
        {
          "word": "at first"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              45,
              57
            ]
          ],
          "ref": "1907, Ronald M. Burrows, The Discoveries In Crete, page 66:",
          "text": "Professor Flinders Petrie, although doubtful at the first, has for many years assigned the deposits in which they were found to the time of the XIIth Dynasty.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Dated form of at first."
      ],
      "id": "en-at_the_first-en-prep_phrase-VD1wkNEZ",
      "links": [
        [
          "at first",
          "at first#English"
        ]
      ],
      "tags": [
        "alt-of",
        "dated"
      ]
    }
  ],
  "word": "at the first"
}

{
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "alt_of": [
        {
          "word": "at first"
        }
      ],
      "categories": [
        "English dated forms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              45,
              57
            ]
          ],
          "ref": "1907, Ronald M. Burrows, The Discoveries In Crete, page 66:",
          "text": "Professor Flinders Petrie, although doubtful at the first, has for many years assigned the deposits in which they were found to the time of the XIIth Dynasty.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Dated form of at first."
      ],
      "links": [
        [
          "at first",
          "at first#English"
        ]
      ],
      "tags": [
        "alt-of",
        "dated"
      ]
    }
  ],
  "word": "at the first"
}