"貞観" meaning in Japanese

{
  "forms": [
    {
      "form": "貞観",
      "ruby": [
        [
          "貞",
          "じょう"
        ],
        [
          "観",
          "がん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "Jōgan",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proper noun",
        "2": "じょうがん"
      },
      "expansion": "貞(じょう)観(がん) • (Jōgan)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ja",
          "name": "Historical periods",
          "orig": "ja:Historical periods",
          "parents": [
            "History",
            "Timekeeping",
            "All topics",
            "Time",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "the Jōgan era, 859-877"
      ],
      "id": "en-貞観-ja-name-8rTengzO",
      "related": [
        {
          "roman": "era preceding Jōgan",
          "ruby": [
            [
              "天安",
              "てんあん"
            ]
          ],
          "word": "天安"
        },
        {
          "roman": "era following Jōgan",
          "ruby": [
            [
              "元慶",
              "がんぎょう"
            ]
          ],
          "word": "元慶"
        }
      ],
      "wikipedia": [
        "Jōgan",
        "ja:貞観 (日本)"
      ]
    }
  ],
  "word": "貞観"
}

{
  "forms": [
    {
      "form": "貞観",
      "ruby": [
        [
          "貞",
          "じょう"
        ],
        [
          "観",
          "がん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "Jōgan",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proper noun",
        "2": "じょうがん"
      },
      "expansion": "貞(じょう)観(がん) • (Jōgan)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "name",
  "related": [
    {
      "roman": "era preceding Jōgan",
      "ruby": [
        [
          "天安",
          "てんあん"
        ]
      ],
      "word": "天安"
    },
    {
      "roman": "era following Jōgan",
      "ruby": [
        [
          "元慶",
          "がんぎょう"
        ]
      ],
      "word": "元慶"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese proper nouns",
        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with two Han script characters",
        "ja:Historical periods"
      ],
      "glosses": [
        "the Jōgan era, 859-877"
      ],
      "wikipedia": [
        "Jōgan",
        "ja:貞観 (日本)"
      ]
    }
  ],
  "word": "貞観"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "貞観"
  ],
  "section": "Japanese",
  "subsection": "proper noun",
  "title": "貞観",
  "trace": ""
}