What does 万一 mean?
万一 is a Japanese noun meaning “by some chance, if by any chance” in English. It can also be translated as “(if) by some chance” depending on context. It is written as 万一 in kanji, まんいち in hiragana, and man'ichi in romaji. This word is part of JLPT N3 vocabulary.
Example sentences
万一の場合に備えて貯金するのは賢明だ。
It is wise to save money for a rainy day.
万一彼がこちらへきたらすぐ知らせます。
If by any chance he comes here, I'll let you know at once.