1To work for or be employed at a company, government office, etc. Usually written 勤める.
父は東京の銀行に勤めています。
My father works at a bank in Tokyo.
大学を卒業してから、ずっと同じ会社に勤めている。
I have worked for the same company ever since I graduated from university.
市役所に勤めている友人に相談してみた。
I consulted a friend who works at the city hall.
どんな会社に勤めたいですか。
What kind of company do you want to work for?
2To serve as or act in a particular role or position (e.g., as a host, chairperson, or lead actor). Usually written 務める.
彼女が今日のイベントの司会を務めます。
She will serve as the host of today's event.
会議の議長を務めることになった。
I have been asked to serve as chairperson of the meeting.
彼はその映画で主役を務めた。
He played the lead role in that movie.
新人の指導役を務めるのは大変だ。
Serving as the mentor for new employees is tough.
3To conduct or perform a religious service or ritual duties (e.g., a Mass or Buddhist devotions). Written 勤める.
神父がミサを勤めた。
The priest conducted the Mass.
祖母は毎朝、仏前で勤めを勤めている。
My grandmother performs her devotions before the family altar every morning.