"乙夜" meaning in Japanese

{
  "etymology_text": "From itsu or otsu (乙, second) + ya (夜, night).",
  "forms": [
    {
      "form": "乙夜",
      "ruby": [
        [
          "乙",
          "いつ"
        ],
        [
          "夜",
          "や"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "乙夜",
      "ruby": [
        [
          "乙",
          "おつ"
        ],
        [
          "夜",
          "や"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "itsuya",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "otsuya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "いつや",
        "2": "おつや"
      },
      "expansion": "乙(いつ)夜(や) or 乙(おつ)夜(や) • (itsuya or otsuya)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "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 multiple readings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "second watch of the five night-watches, around 9pm-11pm"
      ],
      "id": "en-乙夜-ja-noun-pWSNUsLu",
      "raw_glosses": [
        "(historical) second watch of the five night-watches, around 9pm-11pm"
      ],
      "synonyms": [
        {
          "roman": "nikō",
          "ruby": [
            [
              "二更",
              "にこう"
            ]
          ],
          "word": "二更"
        },
        {
          "roman": "niya",
          "ruby": [
            [
              "二夜",
              "にや"
            ]
          ],
          "word": "二夜"
        }
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "乙夜"
}

{
  "etymology_text": "From itsu or otsu (乙, second) + ya (夜, night).",
  "forms": [
    {
      "form": "乙夜",
      "ruby": [
        [
          "乙",
          "いつ"
        ],
        [
          "夜",
          "や"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "乙夜",
      "ruby": [
        [
          "乙",
          "おつ"
        ],
        [
          "夜",
          "や"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "itsuya",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "otsuya",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "いつや",
        "2": "おつや"
      },
      "expansion": "乙(いつ)夜(や) or 乙(おつ)夜(や) • (itsuya or otsuya)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with historical senses",
        "Japanese terms with multiple readings",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with two Han script characters"
      ],
      "glosses": [
        "second watch of the five night-watches, around 9pm-11pm"
      ],
      "raw_glosses": [
        "(historical) second watch of the five night-watches, around 9pm-11pm"
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "synonyms": [
    {
      "roman": "nikō",
      "ruby": [
        [
          "二更",
          "にこう"
        ]
      ],
      "word": "二更"
    },
    {
      "roman": "niya",
      "ruby": [
        [
          "二夜",
          "にや"
        ]
      ],
      "word": "二夜"
    }
  ],
  "word": "乙夜"
}

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

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