万一

• Reading: まんいち
• Romaji: man'ichi
• Kanji breakdown: 万 (man) — ten thousand; 一 (ichi) — one
• Pronunciation: /ma.n.i.tɕi/

Meaning

By some chance; if by any chance; in the unlikely event. Expresses a low-probability scenario.

A noun and adverb used to introduce hypothetical situations that are unlikely but worth preparing for. Literally means 'one in ten thousand.' Often paired with conditional forms like の場合 or たら. Common in safety instructions, insurance contexts, and cautious planning.

Examples

1. 万一に備えて保険に入っておこう。 Let's get insurance just in case something happens.
2. 万一のことがあったら、すぐ連絡してください。 If anything should happen, please contact me right away.
3. 万一遅れる場合は電話をください。 In case you're going to be late, please give me a call.

Usage Guide

Context: safety, insurance, contingency planning

Tone: cautious

Origin & History

Composed of 万 (ten thousand) and 一 (one). The literal meaning 'one in ten thousand' conveys an extremely low probability, similar to the English phrase 'one in a million.'

Cultural Context

Era: Classical

Generation: All ages

Social background: Universal