assumption of office; taking up a post; inauguration (formally beginning duties in a position).
新しい社長が来月就任する予定だ。
The new president is scheduled to take office next month.
市長の就任式には多くの市民が参加した。
Many citizens attended the mayor's inauguration ceremony.
彼は部長に就任して業務の体制を変えた。
He assumed the post of manager and changed the operational structure.