A weekday is one of the days between Saturday and Sunday that we work or go to school.
In everyday life, weekdays are usually what people think of when they say "I have classes on Monday" or "My boss expects me at work by 9 AM every weekday." It's common for schools and workplaces to have a standard schedule where students attend classes and employees do their jobs from around Monday to Friday. People might use the word "weekday" specifically to refer to any of those days, like when they say, "I'm not working on weekends, just weekdays," implying that they don't work during Saturday or Sunday.
A day of the week except those which form the weekend; that is:
