a class that must be taken at the same time as another course

a course that must be studied before, or at the same time as, another specified course

a course that you can take in the same semester as the course with which it is identified as a co-requisite

a compulsory course required to be completed concurrently in order to qualify for the proposed degree.

is a course which may be taken concurrently with or successfully completed prior to the course for which it is required.

A course that must be taken simultaneously within a department.