- invigilate (v.)
- "to watch diligently" (archaic), 1550s, from Latin invigilatus, past participle of invigilare "watch over, be watchful, be devoted," from in- "in" (see in- (2)) + vigilare "to watch, keep awake, not sleep" (see vigil). In late 19c. especially in reference to student exams. Related: Invigilated; invigilating.
