Is Highschool Capitalized

In English usage, should one use high-school, high school, or highschool? (Assume American English; I understand that the Brits call it secondary school.)

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Which one is better: highschool, high-school or high school? Cheers, El Pollo

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Anyways, it has been a long time, but when I was in elementary school, I would just use the grade to talk about older or younger students. He's in grade 3. He's in grade 8; grade 10. We do this in Canada even in highschool. American English has specific words for highschoolers, such as freshman, sophmore, junior, senior, which apply also to college, which we don't do in Canada. I have no idea ...

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