Coeducational describes a school, college, or system in which boys and girls are taught together. A coeducational high school takes both; a coeducational programme is one they share. It is the adjective that sits beside the noun coeducation. In casual American talk people have long shortened it to coed, though that short form now feels dated, and for a time coed was also used of the female students at a mixed college — which is messy, and not what the full word means. The full word is clear and neutral: it is about the school, not about calling a person something.

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