就任

taking office, taking up a position

ɕ ɨː ɲ̟ ĩ ɴ
noun Rare #33,708
taking office, taking up a position Usually refers to formally beginning a role or position.
JA: 新しい社長の就任は来月です。
EN: The new president takes office next month.

彼は大統領に就任した。

He assumed the presidency.

彼らは彼を委員会の議長に就任させた。

They appointed him chair of the committee.

監督就任おめでとう

Congratulations on becoming the manager!

— Pompo the Cinephile (2021)

ケネディー氏は合衆国大統領として就任した。

Mr. Kennedy took office as President of the United States.

シドニー支店長に就任すると伺いました。

I heard that you will be taking over as the head of the Sydney branch.

彼は二年前に就任した。

He took office two years ago.

Sounds similar to