What it means
に際して means “on the occasion of” or “at the time of.” It marks a significant event, action, or transition as the specific occasion when something is done. It is formal and is commonly used in announcements, written explanations, instructions, and official contexts. With a noun, it attaches directly to the noun; with a verb, it normally follows the dictionary form.
Usage note
に際して is more formal than にあたって and is not the usual choice for an ordinary time reference. It generally accompanies an important event, procedure, or change, and it often introduces preparations, precautions, or actions taken for that occasion.
How to use it
会社は新制度の導入に際して、全職員向けの説明会を開きました。
When introducing the new system, the company held a briefing session for all employees.
市は新しい図書館を開館するに際して、地域住民から意見を聞きました。
When opening the new library, the city listened to opinions from local residents.
会社は新制度の導入に際して、全職員向けの説明会を開いた。
When introducing the new system, the company held a briefing session for all employees.
市は新しい図書館を開館するに際して、地域住民から意見を聞いた。
When opening the new library, the city listened to opinions from local residents.