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English definition of “high school”

high school

noun [C/U]    /ˈhɑɪ ˌskul/
a school for children who are about 15 to 18 years old that is usually divided into grades nine through twelve or ten through twelve: [U] Cory will be starting high school in September.
(Definition of high school noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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