n. 25B6; noun
monitors covered all entrances : DETECTOR, scanner, recorder; security camera, CCTV.
UN monitors : OBSERVER, watchdog, overseer, supervisor.
a computer monitor : SCREEN, visual display unit, VDU.
(Brit.) a school monitor : PREFECT, praepostor; senior boy/girl, senior pupil.
25B6; verb his movements were closely monitored : OBSERVE, watch, track, keep an eye on, keep under observation, keep watch on, keep under surveillance, record, note, oversee; informal keep tabs on, keep a beady eye on.