"long eighteenth century" meaning in English

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  "lang_code": "en",
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          "langcode": "en",
          "name": "Eighteen",
          "orig": "en:Eighteen",
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            "Fundamental"
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          "kind": "topical",
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          "name": "Historical periods",
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      "coordinate_terms": [
        {
          "_dis1": "68 32",
          "word": "long nineteenth century"
        },
        {
          "_dis1": "68 32",
          "word": "short twentieth century"
        }
      ],
      "glosses": [
        "The period from 1688 to 1815, beginning with the Glorious Revolution and ending with the Battle of Waterloo."
      ],
      "id": "en-long_eighteenth_century-en-name-hNgDhFcd",
      "links": [
        [
          "period",
          "period#Noun"
        ],
        [
          "beginning",
          "begin#Verb"
        ],
        [
          "Glorious Revolution",
          "Glorious Revolution"
        ],
        [
          "ending",
          "end#Verb"
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      "synonyms": [
        {
          "_dis1": "68 32",
          "word": "long 18th century"
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      ]
    },
    {
      "glosses": [
        "The period from 1660 to 1839."
      ],
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  "word": "long eighteenth century"
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    "en:Eighteen",
    "en:Historical periods"
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    {
      "word": "long nineteenth century"
    },
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      "word": "short twentieth century"
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        "The period from 1688 to 1815, beginning with the Glorious Revolution and ending with the Battle of Waterloo."
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      "glosses": [
        "The period from 1660 to 1839."
      ]
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  "synonyms": [
    {
      "word": "long 18th century"
    }
  ],
  "word": "long eighteenth century"
}