"서른" meaning in Korean

{
  "etymology_templates": [
    {
      "args": {
        "1": "oko-lat",
        "2": "實漢",
        "3": "계림유사"
      },
      "expansion": "First attested as Late Old Korean 實漢 in the Jīlín lèishì (鷄林類事 / 계림유사), 1103",
      "name": "ko-attest"
    },
    {
      "args": {
        "1": "ss",
        "2": "셜흔〮",
        "3": "syèlhún",
        "hangul": "y"
      },
      "expansion": "In the hangul script, first attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 셜흔〮 (Yale: syèlhún).",
      "name": "ko-etym-native"
    }
  ],
  "etymology_text": "First attested as Late Old Korean 實漢 in the Jīlín lèishì (鷄林類事 / 계림유사), 1103. In the hangul script, first attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 셜흔〮 (Yale: syèlhún).",
  "forms": [
    {
      "form": "seoreun",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "numeral"
      },
      "expansion": "서른 • (seoreun)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Korean cardinal numbers",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean numeral symbols",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant transliterations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Native Korean words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "thirty"
      ],
      "id": "en-서른-ko-num-rKX7Wdtp",
      "links": [
        [
          "thirty",
          "thirty"
        ]
      ],
      "qualifier": "native numeral",
      "raw_glosses": [
        "(native numeral) thirty"
      ],
      "synonyms": [
        {
          "alt": "三十",
          "word": "삼십"
        }
      ],
      "wikipedia": [
        "Middle Chinese"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sʰʌ̹ɾɯn]",
      "tags": [
        "SK-Standard",
        "Seoul"
      ]
    },
    {
      "hangeul": "서른"
    },
    {
      "other": "[서른]"
    }
  ],
  "word": "서른"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "oko-lat",
        "2": "實漢",
        "3": "계림유사"
      },
      "expansion": "First attested as Late Old Korean 實漢 in the Jīlín lèishì (鷄林類事 / 계림유사), 1103",
      "name": "ko-attest"
    },
    {
      "args": {
        "1": "ss",
        "2": "셜흔〮",
        "3": "syèlhún",
        "hangul": "y"
      },
      "expansion": "In the hangul script, first attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 셜흔〮 (Yale: syèlhún).",
      "name": "ko-etym-native"
    }
  ],
  "etymology_text": "First attested as Late Old Korean 實漢 in the Jīlín lèishì (鷄林類事 / 계림유사), 1103. In the hangul script, first attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 셜흔〮 (Yale: syèlhún).",
  "forms": [
    {
      "form": "seoreun",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "numeral"
      },
      "expansion": "서른 • (seoreun)",
      "name": "ko-pos"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Korean cardinal numbers",
        "Korean entries with incorrect language header",
        "Korean lemmas",
        "Korean numeral symbols",
        "Korean numerals",
        "Korean terms derived from Middle Korean",
        "Korean terms inherited from Middle Korean",
        "Korean terms with IPA pronunciation",
        "Korean terms with non-redundant non-automated sortkeys",
        "Korean terms with redundant script codes",
        "Korean terms with redundant transliterations",
        "Native Korean words",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "thirty"
      ],
      "links": [
        [
          "thirty",
          "thirty"
        ]
      ],
      "qualifier": "native numeral",
      "raw_glosses": [
        "(native numeral) thirty"
      ],
      "synonyms": [
        {
          "alt": "三十",
          "word": "삼십"
        }
      ],
      "wikipedia": [
        "Middle Chinese"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sʰʌ̹ɾɯn]",
      "tags": [
        "SK-Standard",
        "Seoul"
      ]
    },
    {
      "hangeul": "서른"
    },
    {
      "other": "[서른]"
    }
  ],
  "word": "서른"
}