月曜日

1. Origins, structure, and basic meaning

• Structure: 月曜日 is read as げつようび and is the noun for Monday.
• Basic usage: Monday morning appears in 月曜日の朝, while returning something next Monday appears in 次の月曜日に返す.

2. Common pitfalls and similar expressions

• The time particle に
  • A weekday can take this particle to mark when an action occurs, as in 月曜日に返す.
• Difference from 月曜
  • 月曜 is a shortened form of 月曜日; both mean Monday, but 月曜 is common in schedules and compact labels.