The phrase "an invigilator" is correct and usable in written English.
It is typically used in the context of examinations or assessments, referring to a person who supervises candidates during an exam to ensure that rules are followed.
Example: "The students were nervous as they entered the exam room, where an invigilator was waiting to oversee the test."
Alternatives: "an examiner" or "a proctor".
Instead, an invigilator worked his way up and down a piano's keys, first one way, then the other.
She left dance school to study art history at Bristol University, taking a job as an invigilator at the Arnolfini.
He was a member of Mensa and, in his 80s, pursued an advanced mathematics course with the Open University, for whom he had worked as an invigilator for many years.
I'm not normally sorry that my exam-taking years are behind me, but I've found that as I get older I acquire bits of knowledge that positively demand a sharp pencil and a desk in a quiet room, with an invigilator padding up and down the aisles.
It's not quite the most ridiculous attempt to bump up one's marks in front of an invigilator's eyes, however.
It also creates opportunities for others to contribute when students work from home … By constantly monitoring work on a project in the face-to-face sessions and in Moodle, and by conducting the final face-to-face written exam with an invigilator, fraud is prevented to a certain extent.
"But then about three years later, I had a phone call from an external invigilator who asked me to come down to the exam hall immediately.
Pacing unheard behind these bowed heads, peering over their shoulders, I become an inadvertent invigilator.
On his release from custody, and following Vincent Tabak's arrest, we watched Jefferies all but imprisoned in his flat, unable to fetch groceries, attend his gym, face friends or continue his role as an exam invigilator.
When one comes to assessing students' intelligences with web-based tools, you often find these are creakier than an exam invigilator's Hush Puppies, and the questions one has to answer are facile.
"I really thought: 'I am going to have to vote Labour because it's the lesser of two evils in order to keep the Tories out' – but now, after watching the debate, my feeling is 'Damn it, I'll just go with my heart and vote Green'," said Becca, 58, an exam invigilator.
