same

1. Origins, structure, and basic meaning

• Structure: 同 means same; its on-reading is どう and its kun-reading is おなじ.
• Basic usage: 同じ expresses sameness of an object or quality; 同時, read どうじ, expresses sameness of timing.

2. Common pitfalls and similar expressions

• The same content and the same time
  • 同時に同じ答えを言った conveys two facts: the two people spoke at the same time and gave the same answer.
  • Before a noun, 同じ connects directly, as in 同じ学校.