Invigilate is defined as to watch, especially students taking a written exam.
(verb)An example of invigilate is to proctor students taking the SAT.
See invigilate in Webster's New World College Dictionary
intransitive verb, transitive verb invigilated, invigilating
Origin: < L invigilatus, pp. of invigilare < in-, in, on + vigilare, to watch: see vigil
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