I don't know what terms you are using, but here, we use the following: a) We call blocked section a group of students of the same course or degree. They will have the same professors in all courses. In some universities, this only happens in the first year. In other schools, students will be part of the same block of students until they graduate; they will see the same faces and will have the same professors in all their courses all the time. b) Those who are not part of a blocked section of students are called irregular students. It means they will unlikely see the same faces in each course. They will usually meet different classmates in each course: Math I, History II, Biology 101, Chem 11, etc. EDIT: Do you also use the terms blocked section and irregular in those contexts? Thanks.