Jisho

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Noun
1. (unlikely event of) emergency; the worst(-case scenario); 10000 to 1
  • まんいち万一
  • ばあい場合
  • そな備えて
  • ちょきん貯金
  • する
  • けんめい賢明
It is wise to save money for a rainy day.
Adverb (fukushi), Noun which may take the genitive case particle 'no'
2. (if) by some chance; by some possibility; in the unlikely event that
  • まんいち万一
  • かれ
  • こちら
  • きたら
  • すぐ
  • 知らせます
If by any chance he comes here, I'll let you know at once.
Other forms
万一 【ばんいち】万一 【まんいつ】万一 【ばんいつ】
Notes
ばんいち: Out-dated or obsolete kana usage. まんいつ: Out-dated or obsolete kana usage. ばんいつ: Out-dated or obsolete kana usage.

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