〜次第

Means as soon as something happens and is common in formal business speech.

N3timingformal

Examples

結果が分かり次第、ご連絡いたします。

けっかが わかりしだい、ごれんらく いたします。

I will contact you as soon as the result is known.

条件を確認し次第、お返事いたします。

じょうけんを かくにんししだい、おへんじ いたします。

I will reply as soon as I confirm the conditions.

Meaning

〜次第 means "as soon as..." and sounds formal.

Usage

Attach 次第 to the stem of a verb.

PatternMeaning
Verb stem + 次第as soon as someone does

Notes

This appears often in business emails and calls. It is more formal than 〜たらすぐ.