()

suffix
lesson, section, department
1. lesson, chapter
A numbered section in a textbook or course.
この()(むずか)しい。
This lesson is difficult.
(だい)5()勉強(べんきょう)しましょう。
Let's study Lesson 5.
教科書(きょうかしょ)(だい)10()まで()わったので、来週(らいしゅう)から(あたら)しい(ほん)使(つか)う。
We finished up to Lesson 10 in the textbook, so we'll use a new book starting next week.
2. section, department
A division within an organization.
営業(えいぎょう)()(はたら)いている。
I work in the sales department.
人事(じんじ)()連絡(れんらく)してください。
Please contact the personnel department.
来月(らいげつ)から総務(そうむ)()異動(いどう)することになった。
I'll be transferred to the general affairs department starting next month.

() is a suffix with two main uses: numbered lessons in educational materials and divisions within organizations.

FOR LESSONS:

  • (だい)1(): Lesson 1
  • 教科書(きょうかしょ)(): textbook chapter
  • Often used with (だい)~ prefix for numbering

FOR DEPARTMENTS:

  • 営業(えいぎょう)(): sales section
  • 人事(じんじ)(): personnel department
  • 総務(そうむ)(): general affairs section

ORGANIZATIONAL HIERARCHY:
() is smaller than () (department/division). Common structure: 会社(かいしゃ)()()

RELATED:

  • 課長(かちょう): section chief
  • 課題(かだい): assignment, task