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How to say "One" in Japanese

Both words can translate to "one", but which should you choose?

Japanese Option A

もういちど

もういちど (mou ichido)
N5 / CEFR Syllabus
VS
Japanese Option B

殷鑑不遠

いんかんふえん
C2PLUS / CEFR Syllabus

Nuance Contrast & Translation Difference

When translating "one" into Japanese, you must choose carefully between もういちど and 殷鑑不遠. In Japanese, もういちど (もういちど (mou ichido)) is typically associated with "One more time; Again" (Syllabus Level: N5) and represents Used to request repetition or another attempt. Often combined with 「お願いします」. On the other hand, 殷鑑不遠 (いんかんふえん) maps to "One should learn from the recent mistakes of others; literally 'the warning example of the Yin dynasty is not far off'." (Syllabus Level: C2PLUS) and represents Essential structural term in CEFR C2PLUS vocabulary syllabus.. A literal translation of "one" can often sound unnatural to native Japanese speakers if mixed up!
Bilingual Context for "もういちど"
もう一度言ってください。
Please say it one more time.
Bilingual Context for "殷鑑不遠"
私は殷鑑不遠に興味があります。
I am interested in One should learn from the recent mistakes of others; literally 'the warning example of the Yin dynasty is not far off'..

Nuance Mastery Quiz

Which Japanese word perfectly fits this blank space?

Fill in the blank: "もう一度言ってください。" (Meaning: "Please say it one more time.")
🎉 Correct Answer!

Remember: "もういちど" fits here because it means "One more time; Again" in the context of: "Please say it one more time.". "殷鑑不遠" represents "One should learn from the recent mistakes of others; literally 'the warning example of the Yin dynasty is not far off'.".

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