Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a control device, as on a high-fidelity amplifier, for varying the intensity of high and low frequencies
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A circuit or device in an amplifier designed to increase or decrease the amplification in a specific frequency range without affecting other frequencies.