A course or requirement that must be taken at the same time as another course, rather than before it.
From 'co-' (together) + 'requisite' (from Latin 'requisitus' meaning required). This education term became standard in university systems to describe simultaneous course requirements.
Corequisites are the academic version of 'best taken together'—some courses really do work better side-by-side, like how math helps you understand physics better when you're learning both simultaneously.
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