(especially formerly) a student appointed to assist in the conduct of a class or school, as to help take attendance or keep order.
a person appointed to supervise students, applicants, etc., taking an examination, chiefly to prevent cheating; proctor.
a person who admonishes, especially with reference to conduct.
something that serves to remind or give warning.
a device or arrangement for observing, detecting, or recording the operation of a machine or system, especially an automatic control system.
an instrument for detecting dangerous gases, radiation, etc.
Radio and Television.
a receiving apparatus used in a control room, especially to provide a steady check of the quality of an audio or video transmission.
a similar apparatus placed in various parts of a studio so that an audience can watch a recorded portion of a show, the performer can see the various segments of a program, etc.
any such receiving apparatus used in a closed-circuit system, as in an operating room.
the screen component of a computer, especially a free-standing screen.
a control program.: Compare operating system.
a group of systems used to measure the performance of a computer system.
a former U.S. steam-propelled, armored warship of very low freeboard, having one or more turrets and used for coastal defense.
(initial capital letter, italics) the first of such warships, used against the Confederate ironclad warship Merrimac at Hampton Roads, Va., in 1862.
a raised construction straddling the ridge of a roof and having windows or louvers for lighting or ventilating a building, as a factory or warehouse.
an articulated mounting for a nozzle, usually mechanically operated, which permits a stream of water to be played in any desired direction, as in firefighting or hydraulic mining.
Also called giant. (in hydraulic mining) a nozzle for dislodging and breaking up placer deposits with a jet of water.
any of various large lizards of the family Varanidae, of Africa, southern Asia, the East Indies, and Australia, fabled to give warning of the presence of crocodiles: several species are endangered.
Radio and Television.
to listen to (transmitted signals) on a receiving set in order to check the quality of the transmission.
to view or listen to (television or radio transmissions) in order to check the quality of the video or audio.
to listen to (a radio conversation or channel); keep tuned to.
to observe, record, or detect (an operation or condition) with instruments that have no effect upon the operation or condition.
to oversee, supervise, or regulate: to monitor the administering of a test.
to watch closely for purposes of control, surveillance, etc.; keep track of; check continually: to monitor one's eating habits.
to serve as a monitor, detector, supervisor, etc.
- mon·i·tor·ship, noun
- self-mon·i·tor·ing, adjective
- un·mon·i·tored, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use monitor in a sentence
At the same time, courts in the US and Australia began to experiment with using ankle monitors for an entirely different purpose—enforcing quarantine orders.Covid-19 has led to a worrisome uptick in the use of electronic ankle monitors | Amy Nordrum | October 8, 2020 | MIT Technology Review
DisplayFusion offers even more control over virtual monitors or different areas of your screens.Make the most of your dual or ultrawide monitor setup | David Nield | October 1, 2020 | Popular-Science
Both feature optical heart-rate monitoring, a temperature monitor and an SpO2 sensor — which was possibly the biggest upgrade announced for the Apple Watch Series 6.
Ultra-wide high-definition monitors can totally change your experience—transforming the sad apartment office to a digital command center out of some William Gibson cyberpunk thriller.Ultra-wide computer monitors to enhance your setup | PopSci Commerce Team | September 22, 2020 | Popular-Science
There wasn’t a studio audience but a virtual one, with faces beamed in on monitors put in the audience seats.Ellen DeGeneres vows ‘new chapter’ as her daytime talk show begins its new season | radmarya | September 21, 2020 | Fortune
A guard is manning the door, which is always kept ajar so she can be monitored.
Some eyes in the park watched him while the police monitored the situation from several street corners.The Life and Hard Times Of The Family A Cuban Defector Left Behind | Brin-Jonathan Butler | December 19, 2014 | THE DAILY BEAST
Once back in his Harlem apartment, he closely monitored his condition, taking his temperature twice a day.Why New York’s Ebola Case Will Hurt Infected Patients Everywhere | Abby Haglage | October 24, 2014 | THE DAILY BEAST
For its part, the East German government spied on him and monitored his scripts.
That brings us back to the cloud system monitored by the Cassini mission between July 20 and 22.
The communicator-screen faithfully monitored the end of the commercial.Operation: Outer Space | William Fitzgerald Jenkins
The Med Ship floated free, and Calhoun fretfully monitored all the beacon frequencies known to man.Pariah Planet | Murray Leinster
Very, very carefully, he monitored all the wave-lengths and wave-forms he could discover in use on Weald.Pariah Planet | Murray Leinster
Unattended ground sensors allow critical areas to be monitored continually.Shock and Awe | Harlan K. Ullman
We have monitored reports that the government is checking airlocks at all cities.Rebels of the Red Planet | Charles Louis Fontenay
British Dictionary definitions for monitor
a person or piece of equipment that warns, checks, controls, or keeps a continuous record of something
a senior pupil with various supervisory duties
a pupil assisting a teacher in classroom organization, etc
a television screen used to display certain kinds of information in a television studio, airport, etc
the unit in a desk computer that contains the screen
a loudspeaker used in a recording studio control room to determine quality or balance
a loudspeaker used on stage to enable musicians to hear themselves
a device for controlling the direction of a water jet in fire fighting
any large predatory lizard of the genus Varanus and family Varanidae, inhabiting warm regions of Africa, Asia, and Australia: See also Komodo dragon
Also called: giant mining a nozzle for directing a high-pressure jet of water at the material to be excavated
(formerly) a small heavily armoured shallow-draught warship used for coastal assault
to act as a monitor of
to observe or record (the activity or performance) of (an engine or other device)
to check (the technical quality of) (a radio or television broadcast)
- monitorial (ˌmɒnɪˈtɔːrɪəl), adjective
- monitorially, adverb
- monitorship, noun
- monitress, fem n
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for monitor
A device that accepts video signals from a computer and displays information on a screen. Monitors generally employ cathode-ray tubes or flat-panel displays to project the image. See Note at pixel.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.