Definition of "school day" []

• A day on which school is in session. (noun)
• The part of a day during which school is in session. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A school like Shuang Wen would seem to be the perfect embodiment of values: high academic scores, free and mandatory afternoon classes in Chinese, and, for parents who work long hours, an extended, supervised school day that allows them to worry less about keeping their kids out of trouble."
• "It took only one school day of the kids chanting, “You killed Father Krótki,” every time we stepped out of view of the nuns to sour any aspirations of a musical career: We could kill people."