​(in the US and some other countries) a school for young people between the ages of 14 and 18. I went to high school in Ohio. I was a senior in high school ...

high school noun [countable, uncountable] a school for young people between the ages of 14 and 18

There are three meanings listed in OED's entry for the noun high school, one of which is labelled obsolete. See 'Meaning & use' for definitions, usage, and ...

a school for young people between the ages of 11 and 16 or 18 compare high school, primary school

senior high school noun (also senior high) a school for young people between the ages of 14 and 18 compare junior high school.

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:.

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(also senior high) (in the US and Canada) a school for young people between the ages of 14 and 18 compare junior high school.

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a school for young people between the ages of 12 and 14. compare middle school (2), senior high school.