際さいして

expression

on the occasion of; at the time of; when

Formal expression used as ...に際して. Marks a special or significant occasion, often in announcements, ceremonies, or formal writing.

See also: に際して

• 開かい会かいに際さいして、一ひと言ことご挨あい拶さつを申もうし上あげます。

  On the occasion of the opening, I would like to say a few words of greeting.

• 新しん製せい品ひんの発はつ売ばいに際さいして、記き者しゃ会かい見けんが行おこなわれた。

  A press conference was held on the occasion of the new product launch.