invigilator

The word "invigilator" comes from the Latin vigilare, meaning "to watch." That gives a good picture of the role: an invigilator watches over candidates during an examination and helps protect the fairness of the process. Their job is not simply to police the room, but to make sure the exam is carried out correctly and that everyone is treated by the same rules.

An invigilator may check attendance, distribute papers, give instructions, and monitor students throughout the test. They stay alert for cheating, such as using unauthorized materials, looking at another person's work, or communicating when it is not allowed. They usually do not explain the subject matter or help with the answers, but they can deal with procedural problems, pass on official clarifications, or help with practical issues such as missing materials.

The word is used mainly in formal assessment settings, especially in British English. In North American English, "proctor" is often more common, but the role is very similar. You are most likely to hear "invigilator" for school exams, university exams, and professional tests where supervision matters. So if you picture the calm person keeping the room quiet, following procedure, and making sure the exam stays fair, you are picturing an invigilator.