equalizer

[ee-kwuh-lahy-zer]
noun
1.
a person or thing that equalizes.
2.
any of various devices or appliances for equalizing strains, pressures, etc.
3.
Electricity. an electric network of inductance, capacitance, or resistance established between two points in a given network to secure some constant relation, as even attenuation, between the two points.
4.
Slang. a weapon, as a pistol, blackjack, or switchblade knife.

Origin:
1785–95; equalize + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
equalizer or equaliser (ˈiːkwəˌlaɪzə)
 
n
1.  a person or thing that equalizes, esp a device to counterbalance opposing forces
2.  an electronic network introduced into a transmission circuit to alter its response, esp to reduce distortion by equalizing its response over a specified frequency range
3.  sport a goal, point, etc, that levels the score
4.  slang (US) a weapon, esp a gun
 
equaliser or equaliser
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
equalizer   (ē'kwə-lī'zər)  Pronunciation Key 
An electronic device made of filters and amplifiers, used to alter the relative strengths of different frequencies in an electronic signal. Equalizers are used primarily in audio equipment, allowing fine-tuning of the signal to compensate for distortions such as weak response or oversensitivity at various frequencies. ◇ A graphic equalizer uses a set of controls that determine the level of boost or suppression of individual frequencies. The controls are usually sliding faders, set up in a row from lowest frequency to highest frequency, so that the final settings resemble a graph of the frequency response of the equalizer. ◇ A parametric equalizer consists of one or more filters whose characteristics can be controlled, such as the frequency to be manipulated, whether to boost or suppress the frequency, the amount of boost or suppression, and how much nearby frequencies are also affected.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
From adolescence to high school to college, the technology literally becomes
  almost this great equalizer.
Scholarship is the great equalizer when one is considering faculty promotions
  to full professor and the ideas don't matter.
Guns are the great equalizer because you are quite wrong about one thing.
Such information, if you can get it, is a great equalizer.
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