Someone who invigilates an examination supervises the people who are taking it in order to ensure that it starts and finishes at the correct time, and that there is no cheating. I've taught sixth formers and invigilated exams. + invigilator invigilators in·vigi·la·tor an exam invigilator. to watch people who are taking an examination and make sure that they do not cheat American Equivalent: proctor (invigilare , from vigil; VIGIL)