Noun
the period of instruction in a school; the time period when school is in session
any day on which school is in session
Source: WordNetstay after school Source: Internet
he didn't miss a single day of school Source: Internet
when the school day was done we would walk home together Source: Internet
go to bed early because tomorrow is a school day Source: Internet
According to GamePro in a May 1993 issue, the Japanese authorities had asked Square not to release the game during a school day because schoolchildren would skip class to wait in line for the game. Source: Internet
All school supplies are taken home after the school day, masks are required, desks are spaced out and cleaning supplies are everywhere. Source: Internet