What is the difference between "一旦" and "いったん"?

"一旦" means "once, for a moment, temporarily" (N3), whereas "いったん" represents "once, for a moment" (B2).

Kanji Homophone Battle

Pronunciation Trap: "いったん (ittan)"

Same sound, completely different Kanji! Choose the right conceptual writing.

Kanji Option A

いったん (ittan)

N3 / CEFR

Kanji Option B

いったん (ittan)

B2 / CEFR

In Japanese, many words share the exact same pronunciation "いったん (ittan)" but are written with different Kanji, changing the meaning entirely.

一旦 (Level: N3): Translates to "once, for a moment, temporarily" and is used when Indicates a temporary action or state, often followed by a change or return..
いったん (Level: B2): Maps to "once, for a moment" and carries the nuance of Essential structural term in CEFR B2 vocabulary syllabus..

Mixing these up can easily result in unnatural writing. Look at the bilingual context cards below to master the conceptual boundaries!

Bilingual Context for "一旦"

一旦家に帰ってから、また出かける。

I'll go home once, and then go out again.

Bilingual Context for "いったん"

私はいったんに興味があります。

I am interested in once, for a moment.

Which Kanji perfectly fits this blank space?

Which Kanji perfectly fits the blank: " ＿＿＿家に帰ってから、また出かける。" (Meaning: "I'll go home once, and then go out again.")

🎉 Correct Answer!

Correct! "一旦" is used for "once, for a moment, temporarily" in the context: "I'll go home once, and then go out again.".