就职 means 'to assume office' or 'to take up a position', typically referring to formally beginning a new job, especially in an official, professional, or leadership role. The character 就 (jiù) carries the sense of 'to approach', 'to take up', or 'to enter into', while 职 (zhí) means 'duty', 'post', or 'office'. Together, they convey the act of stepping into a formal role with responsibilities — often used for executives, government officials, teachers, or senior professionals starting a new appointment.

This term is formal and slightly literary; it's common in news reports, official announcements, speeches, and formal writing, but rarely used in casual conversation. It emphasizes the ceremonial or institutional aspect of beginning work — not just showing up, but officially accepting authority and duty. You’ll see it in phrases like 就职典礼 (inauguration ceremony) or 就职演讲 (inaugural address). It’s distinct from everyday terms like 上班 (to go to work) or 入职 (to join a company), which are more neutral or procedural.