"古代" meaning in 日語

{
  "categories": [
    {
      "kind": "other",
      "name": "使用音讀的日語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "寫作「代」讀作「だい」的日語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "寫作「古」讀作「こ」的日語詞",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "日語",
  "lang_code": "ja",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "古代，古世。"
      ],
      "id": "zh-古代-ja-unknown-A-iHqeaf"
    },
    {
      "glosses": [
        "〈史〉古代(指中世纪以前的时代)。"
      ],
      "id": "zh-古代-ja-unknown-q-ILa04t"
    }
  ],
  "word": "古代"
}

{
  "categories": [
    "使用音讀的日語詞",
    "寫作「代」讀作「だい」的日語詞",
    "寫作「古」讀作「こ」的日語詞"
  ],
  "lang": "日語",
  "lang_code": "ja",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "古代，古世。"
      ]
    },
    {
      "glosses": [
        "〈史〉古代(指中世纪以前的时代)。"
      ]
    }
  ],
  "word": "古代"
}