Brit to supervise candidates at an examination
Brit
to supervise (candidates) at an examination
to supervise (an examination)
archaic to keep watch over (something or somebody)
invigilation /-ʹlaysh(ə)n/ noun
invigilator noun
[Latin invigilatus, past part. of invigilare to keep watch, from in-2 + vigilare to watch, from vigil watchful]