Meaning and Usage
"万一" (まんいち) is a conjunction or adverb used to express a very unlikely but possible situation, similar to "if by any chance" or "just in case" in English. It is often used to prepare for unexpected events or to emphasize caution.
Common Contexts
You will frequently see 万一 in safety instructions, warnings, or advice where the speaker wants to highlight a rare but possible risk. It is common in both spoken and written Japanese, especially in formal or semi-formal contexts.
Collocations and Patterns
- 万一 + verb (conditional form): Expresses "if by any chance [something happens]".
- 万一のために: "for the sake of just in case" or "in case of emergency".
Register and Politeness
万一 is neutral and can be used in polite or casual speech depending on the rest of the sentence. It is not overly formal but fits well in business or everyday conversation.
Common Learner Mistake
Learners sometimes confuse 万一 with もし, which also means "if." 万一 implies a lower probability and a sense of caution or preparation, while もし is more neutral. Use 万一 when emphasizing unlikely but possible scenarios.