在職

1. Origins, structure, and basic meaning

• Structure: 在職(ざいしょく) is a noun for being employed at an organization or holding a position; 在職する is its verbal form.
• Basic usage: It describes a period of employment or achievements during it; 在職中(ざいしょくちゅう) means during that employment.

2. Common pitfalls and similar expressions

• 在職中 and 勤務中
  • 在職中 focuses on the period of employment, while 勤務中(きんむちゅう) focuses on time spent on duty. A venture launched during someone's tenure is different from their work situation at a particular time of day.
• What を connects to in a longer sentence
  • In 三十年間在職した会社を今春退職する, 在職した modifies 会社. The を in 会社を connects to the following 退職する; being employed there is expressed as 会社に在職する.