verb (used without object), in·vig·i·lat·ed, in·vig·i·lat·ing.
1.
to keep watch.
2.
British. to keep watch over students at an examination.
Origin: 1545–55; < Latin invigilātus (past participle of invigilāre to keep watch, stay up late), equivalent to in-in-2 + vigilā- (stem of vigilāre to watch; see vigil) + -tus past participle suffix