"鐵器時代" meaning in Korean

{
  "forms": [
    {
      "form": "Cheolgi Sidae",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "Ch'ŏlgi Sidae",
      "tags": [
        "McCune-Reischauer",
        "romanization"
      ]
    },
    {
      "form": "Celki Sitay",
      "tags": [
        "Yale",
        "romanization"
      ]
    },
    {
      "form": "철기 시대",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "hangeul": "철기 시대",
        "mr": "Ch'ŏlgi Sidae",
        "rv": "Cheolgi Sidae",
        "y": "Celki Sitay"
      },
      "expansion": "鐵器時代 • (Cheolgi Sidae or McCune-Reischauer: Ch'ŏlgi Sidae or Yale: Celki Sitay) (hangeul 철기 시대)",
      "name": "ko-proper noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean links with manual fragments",
          "parents": [
            "Links with manual fragments",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "Iron Age",
          "word": "철기 시대"
        }
      ],
      "glosses": [
        "hanja form of 철기 시대 (“Iron Age”)"
      ],
      "id": "en-鐵器時代-ko-name-RW7~WbG3",
      "links": [
        [
          "hanja",
          "hanja#English"
        ],
        [
          "철기 시대",
          "철기 시대#Korean:_鐵器時代"
        ],
        [
          "Iron Age",
          "Iron Age"
        ]
      ],
      "tags": [
        "form-of",
        "hanja"
      ]
    }
  ],
  "word": "鐵器時代"
}

{
  "forms": [
    {
      "form": "Cheolgi Sidae",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "Ch'ŏlgi Sidae",
      "tags": [
        "McCune-Reischauer",
        "romanization"
      ]
    },
    {
      "form": "Celki Sitay",
      "tags": [
        "Yale",
        "romanization"
      ]
    },
    {
      "form": "철기 시대",
      "tags": [
        "hangeul"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "hangeul": "철기 시대",
        "mr": "Ch'ŏlgi Sidae",
        "rv": "Cheolgi Sidae",
        "y": "Celki Sitay"
      },
      "expansion": "鐵器時代 • (Cheolgi Sidae or McCune-Reischauer: Ch'ŏlgi Sidae or Yale: Celki Sitay) (hangeul 철기 시대)",
      "name": "ko-proper noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Korean entries with incorrect language header",
        "Korean hanja forms",
        "Korean lemmas",
        "Korean links with manual fragments",
        "Korean links with redundant alt parameters",
        "Korean links with redundant wikilinks",
        "Korean proper nouns",
        "Korean proper nouns in Han script",
        "Korean terms with non-redundant non-automated sortkeys",
        "Korean terms with redundant script codes",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "Iron Age",
          "word": "철기 시대"
        }
      ],
      "glosses": [
        "hanja form of 철기 시대 (“Iron Age”)"
      ],
      "links": [
        [
          "hanja",
          "hanja#English"
        ],
        [
          "철기 시대",
          "철기 시대#Korean:_鐵器時代"
        ],
        [
          "Iron Age",
          "Iron Age"
        ]
      ],
      "tags": [
        "form-of",
        "hanja"
      ]
    }
  ],
  "word": "鐵器時代"
}