required course(n = noun.act) - a course that all students are required to take;
is a kind of class, course, course of instruction, course of study

as required, blocking course, change course, change of course, collision course, correspondence course, course, course catalog, course catalogue, course credit, course of action, course of instruction, course of lectures, course of study, course session, crash course, damp course, damp-proof course, elective course, extension course, golf course, in due course, links course, main course, matter of course, mizzen course, of course, orientation course, refresher course, required, water course