Tuesday, the second day of the week; used in schedules and calendars. Can be used adverbially (e.g., 'on Tuesday').
毎週火曜日は図書館が休みです。
The library is closed every Tuesday.
火曜日に会議を設定しましょう。
Let's schedule the meeting for Tuesday.
彼は火曜日生まれだ。
He was born on a Tuesday.