際
(Sai)
on the occasion of / at the time of (formal).
Connection rules
- +V plain + 際(に); noun + の + 際(に). The に is optional.
- +Formal temporal marker — for significant moments or occasions.
- +More formal than 〜とき; less ceremonial than 〜にあたって.
Examples
1.
非常の際は、このボタンを押してください。

Hijou no sai wa, kono botan o oshi te kudasai.
In case of emergency, press this button.
「on the occasion of / at the time of (formal)」
2.
ご利用の際には、注意事項をお読みください。

Go riyou no sai ni wa, chuui jikou o o yomi kudasai.
Upon use, please read the precautions.
「on the occasion of / at the time of (formal)」
Practice
Please present your ID at the time of application.
___は、身分証明書をご提示ください。
Romaji also accepted