- any day on which school is conducted.
- the daily hours during which school is conducted: The school day here is from nine to three.
Origin of school day
First recorded in 1580–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for school day
I don't care if we do have to study for six hours every school-day.Our Little Swiss Cousin
Mary Hazelton Wade
It was kind of you to write it, though it was your school-day.Charlotte Bront
T. Wemyss Reid
But when you're sick on a school-day, you'll stay in bed till the next morning.Penrod and Sam
He spoke, for once, without due reflection, and with perhaps an exaggerated remembrance of your school-day offenses.In the Midst of Alarms
Joe and Mattie discuss these plans at the close of Joe's school-day, as they sit on his piazza, his flute for the time silent.The Story of a Life
J. Breckenridge Ellis