In sound parlance, any device that allows a performer to hear themselves. Also applies to most all forms of non end user playback.

On stage, the monitors are usually wedge shaped speakers that point toward the performers. They are mixed to provide the sound that is not present on stage, usually vocals, keyboards, and other non amped instruments, although they often reinforce such instruments.

Larger concerts will have a monitor mixer and engineer that is off to the side of the stage with a special multiple bus console which is fed via a stage splitter. Smaller concerts use the auxiliary buses on the main console.

In studio, the monitors are both for performer and producer, the latter often using speakers called studio monitors and the former commonly using headphones. These allow both parties to hear the mix and, most importantly, allow the performer to hear themselves. The studio monitor speakers are used to mix down the performance, and to monitor the performer.

Common types are Stage Monitors, Studio Monitors, In-Ear Monitors, and Isolation Headphones.
"I need more vocal in the monitor"
"The monitors are feeding back!"
by Captain NeatoMan March 17, 2006
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A monitor outputs data visually!!!
by Fattybuoy January 17, 2019
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1. The space between monitors that exposes light when using a dual or triple monitor setup.
2. The gaping hole or crack between two monitors. If the dual monitor setup has monitors from multiple manufacturers, the vagina tends to be extremely wide (large).
1. "Wow Steve, you have a wide monitor vagina!"
2. "I like the electrical tape covering your monitor vagina!"
3. "Your monitor vagina just queefed!"
3. "Let me diddle your monitor vagina!"
by banger2o4 January 15, 2010
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Someone who wants to rage their fucking face off but can't
and has to watch over the event.
Power Savage had to be a sober monitor at the rager because he was too power hungry at chapter meeting.
by princessfratdaddy December 8, 2011
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is an extension of it's true meaning. someone who polices the halls and rats on fellow peers for petty power, self esteem and approval from elders. someone who gets off or generally thinks they are in charge by randomly busting you. self appointed judges of anything.
by coldchicken23 November 2, 2003
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Monitor Stalking – Someone who glances between two monitors but stares at each monitor in utter confusion while making it appear as though they are attempting to work.
Accountant 1 - I sure wish I had my bank statements.
Accountant 2 - For sure, it's too bad your accounting assistant suffers from monitor stalking.
by lifeduzt March 11, 2010
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