毎回

1. Origins, structure, and basic meaning

• Structure: 毎回 (まいかい) is a noun and adverb meaning every time or each session.
• Basic usage: It describes an action that differs each time or an assignment repeated in every class session.
  • 彼は毎回違う質問を用意してくる。 — He prepares a different question every time.
  • この講座では毎回短い宿題が出る。 — This course assigns a short homework assignment each session.

2. Common pitfalls and similar expressions

• Every session and this session
  • 毎回 covers each occurrence in a repeated series, while 今回 identifies only the present occurrence.