椅子

1. Origins, structure, and basic meaning

• Structure: 椅子(いす) is a chair, a piece of furniture for sitting.
• Basic usage: It describes sitting in a chair by the window and reading a book.
  • 窓際の椅子に座って本を読んだ。

2. Common pitfalls and similar expressions

• Chair and place to sit
  • 椅子 denotes the furniture itself, while 席(せき) denotes a place to sit or an assigned seat. 席が空いている means that a place is available.