在京

1. Origins, structure, and basic meaning

• Structure: 在京 is read as ざいきょう and means residing or staying in Tokyo.
• Basic usage: Use 在京の友人 for a friend who is in Tokyo and 在京中の日記 for a diary kept during a stay in Tokyo.

2. Common pitfalls and similar expressions

• Difference between 在京 and 上京
  • The former is the state of being in Tokyo, whereas the latter is the movement of going to Tokyo from elsewhere.