noun, noun or participle which takes 'suru', intransitive verb
taking up a new post; assuming a new position
Formal term used when someone arrives at a new workplace or officially starts a new assignment. Often used in business, government, or military contexts.
新しい校長が来月着任する予定です。
The new principal is scheduled to take up the post next month.
彼は着任早々
Soon after assuming his new position, he attended an important meeting.