まんいち（万一） (manichi): If by any chance; in the unlikely event
～まんいち（万一） (manichi)
Meaning
If by any chance; in the unlikely event
Formation and usage
万一 + conditional clause
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Introduces an unlikely or adverse contingency and an appropriate response.
Examples
万一、会議が延期されたら、すぐに連絡します。
If the meeting is postponed, I will contact you immediately.
万一、試験が延期されたら、すぐに連絡します。
If the exam is postponed, I will contact you immediately.
万一、研修が延期されたら、すぐに連絡します。
If the training session is postponed, I will contact you immediately.
万一、発表会が延期されたら、すぐに連絡します。
If the presentation event is postponed, I will contact you immediately.
万一、面接が延期されたら、すぐに連絡します。
If the interview is postponed, I will contact you immediately.
How related patterns differ
さらに adds or increases; 何といっても singles out the strongest feature, while 何しろ gives a salient reason. さすがに can meet expectations or acknowledge a limit. いったい intensifies a question, 万一 anticipates a risk, and たちまち marks rapid change.