A day during which the public schools are open, usually synonymous with weekday during the school year.
In modern China, Sunday is not usually a schoolday except around major holidays.
The part of a day when students attend school.
I couldn't contact my child during the schoolday because of the school's no-cellphone policy.
The period of one's life when one attends school, particularly, primary school (as opposed to college days); one's youth.
I can hardly remember my schooldays now that I have reached middle age.