"古本" meaning in Japanese

{
  "forms": [
    {
      "form": "古本",
      "ruby": [
        [
          "古",
          "ふる"
        ],
        [
          "本",
          "ほん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "furuhon",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ふるほん"
      },
      "expansion": "古(ふる)本(ほん) • (furuhon)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms read with yutōyomi",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with Heiban pitch accent (Tōkyō)",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              15,
              17
            ]
          ],
          "bold_translation_offsets": [
            [
              95,
              105
            ]
          ],
          "english": "At those kinds of event venues, there are all sorts of things like the trading of antiques and used books, right?",
          "ref": "2018 April 13, 大河原雅子, quotee, “第196回国会 衆議院 内閣委員会 第10号 平成30年4月13日”, in 国会会議録検索システム, 国立国会図書館:",
          "roman": "Sō iu ibento kaijō de, furumono, furuhon no torihiki to ka iroiro ari-masu yo ne.",
          "text": "そういうイベント会場で、古物、古本の取引とかいろいろありますよね。",
          "translation": "At those kinds of event venues, there are all sorts of things like the trading of antiques and used books, right?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "secondhand books"
      ],
      "id": "en-古本-ja-noun-MJTfAw-K",
      "links": [
        [
          "secondhand",
          "secondhand"
        ],
        [
          "book",
          "book"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "ふるほん"
    },
    {
      "ipa": "[ɸɯ̟ɾɯ̟hõ̞ɴ]"
    }
  ],
  "word": "古本"
}

{
  "forms": [
    {
      "form": "古本",
      "ruby": [
        [
          "古",
          "ふる"
        ],
        [
          "本",
          "ほん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "furuhon",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ふるほん"
      },
      "expansion": "古(ふる)本(ほん) • (furuhon)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms read with yutōyomi",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with 古 read as ふる",
        "Japanese terms spelled with 本 read as ほん",
        "Japanese terms with 2 kanji",
        "Japanese terms with Heiban pitch accent (Tōkyō)",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation with pitch accent",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with quotations",
        "Japanese terms with redundant sortkeys",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              15,
              17
            ]
          ],
          "bold_translation_offsets": [
            [
              95,
              105
            ]
          ],
          "english": "At those kinds of event venues, there are all sorts of things like the trading of antiques and used books, right?",
          "ref": "2018 April 13, 大河原雅子, quotee, “第196回国会 衆議院 内閣委員会 第10号 平成30年4月13日”, in 国会会議録検索システム, 国立国会図書館:",
          "roman": "Sō iu ibento kaijō de, furumono, furuhon no torihiki to ka iroiro ari-masu yo ne.",
          "text": "そういうイベント会場で、古物、古本の取引とかいろいろありますよね。",
          "translation": "At those kinds of event venues, there are all sorts of things like the trading of antiques and used books, right?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "secondhand books"
      ],
      "links": [
        [
          "secondhand",
          "secondhand"
        ],
        [
          "book",
          "book"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "other": "ふるほん"
    },
    {
      "ipa": "[ɸɯ̟ɾɯ̟hõ̞ɴ]"
    }
  ],
  "word": "古本"
}