"万一" meaning in Japanese

{
  "forms": [
    {
      "form": "万一",
      "ruby": [
        [
          "万",
          "まん"
        ],
        [
          "一",
          "いち"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "man'ichi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "adverb",
        "2": "まんいち"
      },
      "expansion": "万(まん)一(いち) • (man'ichi)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "perhaps"
      ],
      "id": "en-万一-ja-adv-G6LrsnXo",
      "links": [
        [
          "perhaps",
          "perhaps"
        ]
      ]
    }
  ],
  "word": "万一"
}

{
  "forms": [
    {
      "form": "万一",
      "ruby": [
        [
          "万",
          "まん"
        ],
        [
          "一",
          "いち"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "man'ichi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "まんいち"
      },
      "expansion": "万(まん)一(いち) • (man'ichi)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "0 6 94",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "0 3 97",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "4 96",
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "9 91",
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "8 92",
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "33 67",
          "kind": "other",
          "name": "Japanese terms with 2 kanji",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "8 92",
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "a quite rare case - literally, one for ten thousands."
      ],
      "id": "en-万一-ja-noun-~NXxumSF"
    }
  ],
  "word": "万一"
}

{
  "categories": [
    "Japanese adverbs",
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese links with redundant alt parameters",
    "Japanese links with redundant wikilinks",
    "Japanese nouns",
    "Japanese terms spelled with first grade kanji",
    "Japanese terms spelled with second grade kanji",
    "Japanese terms with 2 kanji",
    "Japanese terms with redundant sortkeys",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "万一",
      "ruby": [
        [
          "万",
          "まん"
        ],
        [
          "一",
          "いち"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "man'ichi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "adverb",
        "2": "まんいち"
      },
      "expansion": "万(まん)一(いち) • (man'ichi)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "perhaps"
      ],
      "links": [
        [
          "perhaps",
          "perhaps"
        ]
      ]
    }
  ],
  "word": "万一"
}

{
  "categories": [
    "Japanese adverbs",
    "Japanese entries with incorrect language header",
    "Japanese lemmas",
    "Japanese links with redundant alt parameters",
    "Japanese links with redundant wikilinks",
    "Japanese nouns",
    "Japanese terms spelled with first grade kanji",
    "Japanese terms spelled with second grade kanji",
    "Japanese terms with 2 kanji",
    "Japanese terms with redundant sortkeys",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "万一",
      "ruby": [
        [
          "万",
          "まん"
        ],
        [
          "一",
          "いち"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "man'ichi",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "まんいち"
      },
      "expansion": "万(まん)一(いち) • (man'ichi)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "a quite rare case - literally, one for ten thousands."
      ]
    }
  ],
  "word": "万一"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "万一"
  ],
  "section": "Japanese",
  "subsection": "adverb",
  "title": "万一",
  "trace": ""
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "万一"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "万一",
  "trace": ""
}