From Longman Dictionary of Contemporary Englishstudent unionˌstudent ˈunion (also students’ union British English) noun [countable] 1 SECa building where students go to meet socially2 British EnglishSE an association of students in a particular college or university
Examples from the Corpus
student union• A student union called for a one-day strike at local colleges.• Teviot Row House is the oldest purpose-built student union in Britain, dating back to 1889.• Finally, it's worth noting that most colleges have an extensive range of services offered by the college or student union.• Detectives said the crime was pre-meditated. p-t-c Reaction to the sentence from the student union was mixed.• One stands proudly in the main lobby of the student union at the Massachusetts Institute of Technology.• The student union are taking legal advice about whether they can take any further action to recover the missing money. 