noun

• Any individual day of the week, except those which form the weekend or the single weekly day off; that is:
• Monday, Tuesday, Wednesday, Thursday or Friday, but not Saturday or Sunday.
• (Islam) Saturday, Sunday, Monday, Tuesday, Wednesday, Thursday, but not Friday.
• Monday, Tuesday, Wednesday, Thursday, Friday, or Saturday, but not Sunday. (e.g. in Vietnam)
• (Judaism) Sunday, Monday, Tuesday, Wednesday, Thursday or Friday, but not Saturday.
• (now rare) Any day of the week (Monday through Sunday).