mon·​i·​tor | \ ˈmä-nə-tər How to pronounce monitor (audio) \

Definition of monitor

 (Entry 1 of 2)

1a : a student appointed to assist a teacher
b : one that warns or instructs monitors and instructors for troops green in the art of warNew York Times
c : one that monitors or is used in monitoring: such as
(1) : an electronic device with a screen used for display (as of television pictures or computer information)
(2) : a device for observing a biological condition or function a heart monitor
3 [Monitor, first ship of the type]
a : a heavily armored warship formerly used in coastal operations having a very low freeboard and one or more revolving gun turrets
b : a small modern warship with shallow draft (see draft entry 1 sense 8) for coastal bombardment
4 : a raised central portion of a roof having low windows or louvers for providing light and air


monitored; monitoring\ ˈmä-​nə-​t(ə-​)riŋ How to pronounce monitoring (audio) \

Definition of monitor (Entry 2 of 2)

transitive verb

: to watch, keep track of, or check usually for a special purpose Nurses monitored the patient's heart rate.

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Other Words from monitor


monitorial \ ˌmä-​nə-​ˈtȯr-​ē-​əl How to pronounce monitorial (audio) \ adjective
monitorship \ ˈmä-​nə-​tər-​ˌship How to pronounce monitorship (audio) \ noun

Synonyms for monitor

Synonyms: Verb

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Examples of monitor in a Sentence

Noun They watched the press conference on a video monitor in a back room. We put a baby monitor in the nursery. U.N. weapons monitors and inspectors. Verb Nurses constantly monitored the patient's heart rate. We're in a good position to monitor and respond to customer concerns. Government agents have been monitoring the enemy's radio communications.
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Recent Examples on the Web: Noun This version of AcuraWatch has improved pedestrian-sensing capabilities and an enhanced collisionmitigation braking system, as well as a driver attention monitor and traffic-jam assist. Sebastian Blanco, Car and Driver, "2021 Acura TLX's New Kind of Airbag Could Cradle Your Head in a Crash," 18 June 2020 In addition, Cinemark will increase the fresh air intake to improve air quality and have a clean and safety monitor on duty to make sure everybody is following the rules. cleveland, "Back to the movies: Cinemark, Regal Cinemas set reopening dates in July," 18 June 2020 Over the course of more than two years, Deutsche Bank had implemented numerous recommendations from the monitor to improve its reporting, the CFTC said. Dylan Tokar, WSJ, "Deutsche Bank Settles Swap Reporting Outage, Spoofing Violations," 18 June 2020 The county told The Republic that Correctional Health staff self-monitor daily for fevers and other symptoms. Lauren Castle, azcentral, "Federal lawsuit filed against Maricopa County for treatment of inmates during COVID-19," 16 June 2020 Crutcher imagined how such a monitor might have changed the outcome of the Shelby investigation. Victor Luckerson, The New Yorker, "Tulsa’s Hopeful Anger," 16 June 2020 Meza admonished Dominguez and issued a warning to keep her GPS monitor charged and to stay in touch. Elizabeth Zavala,, "Courtrooms in San Antonio being outfitted with protective shields, barriers for cornavirus protection," 15 June 2020 In 2019 revenues from sales of home-studio products (including microphones, audio interfaces, mixers, studio monitor speakers and headphones) exceeded $700m according to FutureSource, a consultancy. The Economist, "Sofa sessions The pandemic has brought about a home-studio boom," 15 June 2020 Neal assumed a new position in March as the police oversight monitor in Fort Worth. Max Londberg,, "Why is Cincinnati now moving to fund police watchdog? 'We got called out' by protest," 11 June 2020 Recent Examples on the Web: Verb Children, the elderly and people with breathing difficulties should monitor their outdoor activity and check air-quality readings at Robin Goist, cleveland, "Air quality advisory issued for Northeast Ohio," 19 June 2020 People under quarantine are asked to stay at home for 14 days and monitor their symptoms and to not attend school or work or be in other public settings. Leada Gore |, al, "Kansas adds Alabama to travel quarantine list," 18 June 2020 Jaynes wrote that the subjects have a history of attempting to destroy evidence, use cameras to monitor police and have a history of fleeing law enforcement. Tessa Duvall, USA TODAY, "Louisville detective who obtained no-knock warrant for Breonna Taylor's apartment reassigned," 17 June 2020 But there are other, equally critical ways that antibody testing could help to monitor and ultimately control the pandemic in coming months. Alice Park, Time, "Antibody Tests Don't Mean a Ton Right Now. But That Could Change Soon," 16 June 2020 LaVoy also cited concerns that the county will not monitor the course when there is a buyer. Cathy Kozlowicz, Milwaukee Journal Sentinel, "Menomonee Falls residents are concerned a residential developer will purchase Wanaki Golf Course," 15 June 2020 Facebook's Whatsapp was blocked in 2017, weeks before a large Communist Party gathering—a common move by Chinese government censors to limit and monitor discussion of sensitive topics and ensure important political events run smoothly. Naomi Xu Elegant, Fortune, "Zoom’s censorship stumble is a familiar narrative for tech stuck between U.S. and Beijing," 12 June 2020 Schmidt said the next several months will be telling as researchers monitor those who had positive antibody tests. Tresa Baldas, Detroit Free Press, "COVID-19 antibody tests flood market: Which ones medical professionals recommend," 11 June 2020 But with each neighbourhood having only a handful of permanent staff to monitor and help hundreds of people, manpower was far from adequate. The Economist, "On every street China’s Communist Party worries about its grassroots weakness," 11 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'monitor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of monitor


1530, in the meaning defined at sense 1a


1924, in the meaning defined above

History and Etymology for monitor

Noun and Verb

Latin, one that warns, overseer, from monēre to warn — more at mind

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Time Traveler for monitor

Time Traveler

The first known use of monitor was in 1530

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Statistics for monitor

Last Updated

21 Jun 2020

Cite this Entry

“Monitor.” Dictionary, Merriam-Webster, Accessed 2 Jul. 2020.

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More Definitions for monitor


How to pronounce monitor (audio)

English Language Learners Definition of monitor

 (Entry 1 of 2)

: a device that shows information or images on a screen
: a device that is used to listen to sounds being made in another room
: a device that shows and records information about a condition or function of the body



English Language Learners Definition of monitor (Entry 2 of 2)

: to watch, observe, listen to, or check (something) for a special purpose over a period of time


mon·​i·​tor | \ ˈmä-nə-tər How to pronounce monitor (audio) \

Kids Definition of monitor

 (Entry 1 of 2)

1 : a video screen used for display (as of television pictures or computer information)
2 : a student in a school picked for a special duty (as keeping order)
3 : a person or thing that watches or checks something a heart monitor


monitored; monitoring

Kids Definition of monitor (Entry 2 of 2)

: to watch or check for a special reason Nurses monitored the patient's heart rate.


mon·​i·​tor | \ ˈmän-ət-ər How to pronounce monitor (audio) \

Medical Definition of monitor

 (Entry 1 of 2)

: one that monitors especially : a device for observing or measuring a biologically important condition or function a heart monitor
monitored; monitoring\ ˈmän-​ət-​ə-​riŋ, ˈmän-​ə-​triŋ How to pronounce monitoring (audio) \

Medical Definition of monitor (Entry 2 of 2)

1 : to watch, observe, or check closely or continuously monitor a patient's vital signs
2 : to test for intensity of radiations especially if due to radioactivity

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