A requirement, usually enrollment in a course, which should be undertaken at the same time as the course being described (if that requirement or its equivalent has not been completed previously)
A dependency in which a fileset requires that another fileset be installed or configured at the same time For example, if fileset A requires that fileset B is installed at the same time, fileset B is a corequisite
Enrollment in a companion course is required The information presented or the practice gained in the corequisite course is considered necessary for success in the target course