school_day has definitions from the field of education
1
[ noun ] (education) the period of instruction in a school; the time period when schools is in session

Synonyms

school schooltime

Examples

"stay after school" "he didn't miss a single day of school" "when the school day was done we would walk home together"

Related terms

time_period study_hall school

2
[ noun ] (education) any day on which school is in session

Examples

"go to bed early because tomorrow is a school day"

Related terms

day study_hall

*