invigilator (noun)

1. During the intense anime convention, the invigilator diligently observed the competition to ensure that no contestant was cheating.

2. The art museum assigned an invigilator to closely monitor the visitors, ensuring that no one would attempt to vandalize or steal the artwork.

3. In the imaginary world of wizards and mystical creatures, the invigilator kept a watchful eye on the participants of the magical duel to prevent any form of cheating.

4. During the sacred ceremony, the invigilator resolutely supervised the devotees, guaranteeing no one would breach the religious rituals or engage in dishonest practices.