D defs.my
Entry 2 senses Webster, 1913

invigilate

/(ĭn*vĭj"ĭl*āt)/ · IPA /ɪnˈvɪdʒɪleɪt/
01 n. To keep watch.
imp. & p. p. Invigilated; p. pr. & vb. n. Invigilating
  1. 1.
    To keep watch.
  2. 2.
    To keep watch over examination candidates to prevent cheating.[British]