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negative feedback

noun, Electronics.
1.
See under feedback (def 1).

feedback

[feed-bak] /ˈfidˌbæk/
noun
1.
Electronics.
  1. the process of returning part of the output of a circuit, system, or device to the input, either to oppose the input (negative feedback) or to aid the input (positive feedback)
  2. acoustic feedback.
2.
the furnishing of data concerning the operation or output of a machine to an automatic control device or to the machine itself, so that subsequent or ongoing operations of the machine can be altered or corrected.
3.
a reaction or response to a particular process or activity:
He got very little feedback from his speech.
4.
evaluative information derived from such a reaction or response:
to study the feedback from an audience survey.
5.
Psychology. knowledge of the results of any behavior, considered as influencing or modifying further performance.
Compare biofeedback.
6.
Biology. a self-regulatory biological system, as in the synthesis of some hormones, in which the output or response affects the input, either positively or negatively.
Origin
1915-1920
1915-20; noun use of verb phrase feed back
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for negative feed-back

feedback

/ˈfiːdˌbæk/
noun
1.
  1. the return of part of the output of an electronic circuit, device, or mechanical system to its input, so modifying its characteristics. In negative feedback a rise in output energy reduces the input energy; in positive feedback an increase in output energy reinforces the input energy
  2. that part of the output signal fed back into the input
2.
the return of part of the sound output by a loudspeaker to the microphone or pick-up so that a high-pitched whistle is produced
3.
the whistling noise so produced
4.
  1. the effect of the product of a biological pathway on the rate of an earlier step in that pathway
  2. the substance or reaction causing such an effect, such as the release of a hormone in a biochemical pathway
5.
information in response to an inquiry, experiment, etc: there was little feedback from our questionnaire
verb, adverb
6.
(transitive) to return (part of the output of a system) to its input
7.
to offer or suggest (information, ideas, etc) in reaction to an inquiry, experiment, etc

negative feedback

noun
1.
See feedback
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
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Word Origin and History for negative feed-back

feedback

n.

1920, in the electronics sense, from feed + back (adj.). Transferred use, "information about the results of a process" is attested by 1955.

Online Etymology Dictionary, © 2010 Douglas Harper
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negative feed-back in Medicine

feedback feed·back (fēd'bāk')
n.

  1. The return of a portion of the output of a process or system to the input, especially when used to maintain performance or to control a system or process.

  2. The portion of the output so returned.

  3. The return of information about the result of a process or activity.

negative feedback n.
Feedback that reduces the output of a system.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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negative feed-back in Science
feedback
  (fēd'bāk')   
The supply of an input to some process or system as a function of its output. See more at negative feedback, positive feedback.

negative feedback  
Feedback in which the output quantity or signal lowers the input quantity or signal. Negative feedback is used in natural and artificial regulatory mechanisms, as well as in the design of oscillators.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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negative feed-back in Culture

feedback definition


A process in which a system regulates itself by monitoring its own output. That is, it “feeds back” part of its output to itself. Feedback is used to control machines; a heating system, for example, uses a thermostat to monitor and adjust its output. Feedback is also used by the human brain to control various muscles and joints.

Note: By extension, “feedback” is any response or information about the result of a process.
Note: Feedback is usually a feature of automation.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for negative feed-back

feedback

noun

Response, esp information and opinion: We'll wait for feedback before we try anything else

[1950s+; fr the portion of output fed back to the input in an automatic control circuit or system]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Encyclopedia Article for negative feed-back

feedback

in biology, a response within a system (molecule, cell, organism, or population) that influences the continued activity or productivity of that system. In essence, it is the control of a biological reaction by the end products of that reaction.

Learn more about feedback with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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