"elsőben" meaning in Hungarian

{
  "etymology_templates": [
    {
      "args": {
        "1": "hu",
        "2": "első",
        "3": "-ben",
        "nocat": "y"
      },
      "expansion": "első + -ben",
      "name": "affix"
    }
  ],
  "etymology_text": "első + -ben",
  "head_templates": [
    {
      "args": {
        "1": "hu",
        "2": "numeral form"
      },
      "expansion": "elsőben",
      "name": "head"
    }
  ],
  "hyphenation": [
    "el‧ső‧ben"
  ],
  "lang": "Hungarian",
  "lang_code": "hu",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Hungarian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "első"
        }
      ],
      "glosses": [
        "inessive singular of első"
      ],
      "id": "en-elsőben-hu-num-3ZsVOdS6",
      "links": [
        [
          "első",
          "első#Hungarian"
        ]
      ],
      "tags": [
        "form-of",
        "inessive",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈɛlʃøːbɛn]"
    }
  ],
  "word": "elsőben"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "hu",
        "2": "első",
        "3": "-ben",
        "nocat": "y"
      },
      "expansion": "első + -ben",
      "name": "affix"
    }
  ],
  "etymology_text": "első + -ben",
  "head_templates": [
    {
      "args": {
        "1": "hu",
        "2": "numeral form"
      },
      "expansion": "elsőben",
      "name": "head"
    }
  ],
  "hyphenation": [
    "el‧ső‧ben"
  ],
  "lang": "Hungarian",
  "lang_code": "hu",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Hungarian entries with incorrect language header",
        "Hungarian non-lemma forms",
        "Hungarian numeral forms",
        "Hungarian terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "első"
        }
      ],
      "glosses": [
        "inessive singular of első"
      ],
      "links": [
        [
          "első",
          "első#Hungarian"
        ]
      ],
      "tags": [
        "form-of",
        "inessive",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈɛlʃøːbɛn]"
    }
  ],
  "word": "elsőben"
}