A school for teenagers, typically grades 9-12, between middle school and college or university.
A compound of 'high' (elevated, advanced) and 'school.' The term 'high school' originated in America in the late 1800s as a distinction between elementary schools and more advanced secondary education.
High school is a surprisingly modern institution—it didn't really exist widely until the late 1800s when America needed a way to educate teenagers beyond elementary skills! Before that, you either went to elementary school or you went to college; the middle ground had to be invented.
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