- a person who advises, warns, or cautions
- in some schools, a student chosen to help keep order, record attendance, etc.
- something that reminds or warns
- any of a family (Varanidae) of usually very large, flesh-eating lizards of Africa, S Asia, and Australia: from the notion that they warn of the presence of crocodiles
Origin of monitorafter the Monitor, first such ship, built in 1862Historical a heavily armored warship with a low, flat deck and heavy guns fitted in one or more revolving turrets
- a mounting for a nozzle that allows a stream of water to be played in any direction, as in fire fighting
- a person who monitors a foreign broadcast, etc.
- any of various devices for checking or regulating the performance of machines, aircraft, guided missiles, etc.
- an instrument for measuring radioactive contamination by means of the ionizing radiation being emitted
- any device, typically one of a pair, designed to allow someone to view or listen in on persons or activities in another room or location: a baby monitor in a nursery
- Comput. a video screen for displaying data, graphic images, etc.
- a receiver or speaker, as in the control room of a broadcasting studio, for checking the quality of the transmission
Origin of monitorClassical Latin from past participle of monere, to warn from Indo-European an unverified form moni- from base an unverified form men-, to think from source mind
- to watch or check on (a person or thing) as a monitor
- to observe, check on, or regulate the performance of (a machine, an employee, etc.)
- to test for radioactive contamination with a monitor
- to listen in on (a foreign broadcast, telephone conversation, etc.) as for gathering political or military information
- to check the quality of (transmission) with or as with a monitor