monitor

[mon-i-ter]
noun
1.
a student appointed to assist in the conduct of a class or school, as to help take attendance or keep order.
2.
a person appointed to supervise students, applicants, etc., taking an examination, chiefly to prevent cheating; proctor.
3.
a person who admonishes, especially with reference to conduct.
4.
something that serves to remind or give warning.
5.
a device or arrangement for observing, detecting, or recording the operation of a machine or system, especially an automatic control system.
6.
an instrument for detecting dangerous gases, radiation, etc.
7.
Radio and Television.
a.
a receiving apparatus used in a control room, especially to provide a steady check of the quality of an audio or video transmission.
b.
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.
c.
any such receiving apparatus used in a closed-circuit system, as in an operating room.
8.
Computers.
a.
a component, as a CRT, with a screen for viewing data at a computer terminal.
b.
a control program. Compare operating system.
c.
a group of systems used to measure the performance of a computer system.
9.
Nautical.
a.
a former U.S. steam-propelled, armored warship of very low freeboard, having one or more turrets and used for coastal defense.
b.
(initial capital letter, italics) the first of such warships, used against the Confederate ironclad warship Merrimac at Hampton Roads, Va., in 1862.
10.
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.
11.
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.
12.
Also called giant. (in hydraulic mining) a nozzle for dislodging and breaking up placer deposits with a jet of water.
13.
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.
verb (used with object)
14.
Radio and Television.
a.
to listen to (transmitted signals) on a receiving set in order to check the quality of the transmission.
b.
to view or listen to (television or radio transmissions) in order to check the quality of the video or audio.
c.
to listen to (a radio conversation or channel); keep tuned to.
15.
to observe, record, or detect (an operation or condition) with instruments that have no effect upon the operation or condition.
16.
to oversee, supervise, or regulate: to monitor the administering of a test.
17.
to watch closely for purposes of control, surveillance, etc.; keep track of; check continually: to monitor one's eating habits.
verb (used without object)
18.
to serve as a monitor, detector, supervisor, etc.

Origin:
1540–50; < Latin: prompter, adviser, equivalent to moni-, variant stem of monēre to remind, advise, warn + -tor -tor

monitorship, noun
self-monitoring, adjective
unmonitored, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
monitor (ˈmɒnɪtə)
 
n
1.  a person or piece of equipment that warns, checks, controls, or keeps a continuous record of something
2.  education
 a.  a senior pupil with various supervisory duties
 b.  a pupil assisting a teacher in classroom organization, etc
3.  a television screen used to display certain kinds of information in a television studio, airport, etc
4.  the unit in a desk computer that contains the screen
5.  a.  a loudspeaker used in a recording studio control room to determine quality or balance
 b.  a loudspeaker used on stage to enable musicians to hear themselves
6.  a device for controlling the direction of a water jet in fire fighting
7.  See also Komodo dragon any large predatory lizard of the genus Varanus and family Varanidae, inhabiting warm regions of Africa, Asia, and Australia
8.  mining Also called: giant a nozzle for directing a high-pressure jet of water at the material to be excavated
9.  (formerly) a small heavily armoured shallow-draught warship used for coastal assault
 
vb
10.  to act as a monitor of
11.  to observe or record (the activity or performance) of (an engine or other device)
12.  to check (the technical quality of) (a radio or television broadcast)
 
[C16: from Latin, from monēre to advise]
 
monitorial
 
adj
 
moni'torially
 
adv
 
'monitorship
 
n
 
'monitress
 
fem n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

monitor
1540s, "senior pupil at a school charged with keeping order, etc.," from L. monitor "one who reminds, admonishes, or checks," from monere "to admonish, warn, advise," related to memini "I remember, I am mindful of," and to mens "mind," from PIE base *men- "to think" (see
mind (n.)). The lizard so called because it is supposed to give warning of crocodiles (1826). Meaning "squat, slow-moving type of ironclad warship" (1862) so called from name of the first vessel of this design, chosen by Capt. Ericsson because it was meant to "admonish" the Confederate leaders in the U.S. Civil War. Broadcasting sense of "a device to continuously check on the technical quality of a transmission" (1931) led to special sense of "a TV screen displaying the picture from a particular camera." The verb is attested from 1924. Related: Monitored; monitoring.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

monitor mon·i·tor (mŏn'ĭ-tər)
n.
A usually electronic device used to record, regulate, or control a process or system. v. mon·i·tored, mon·i·tor·ing, mon·i·tors

    The American Heritage® Stedman's Medical Dictionary
    Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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    American Heritage
    Science Dictionary
    monitor   (mŏn'ĭ-tər)  Pronunciation Key 
    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 © 2002. Published by Houghton Mifflin. All rights reserved.
    Cite This Source
    Example sentences
    One rests somewhere along the shifting ocean floor, the other rests in a well-monitored laboratory tank.
    It breeds corruption, by allowing politicians to siphon off poorly monitored
      funds.
    Conversations between prisoners could be overheard anywhere, and were closely
      monitored.
    The use of professional informers should be limited and carefully monitored.
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