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[am-pluh-fahy-er] /ˈæm pləˌfaɪ ər/
a person or thing that amplifies or enlarges.
an electronic component or circuit for amplifying power, current, or voltage.
Origin of amplifier
1540-50; amplify + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for amplifier
  • By using an amplifier device, they're able to push radar waves through walls up to eight inches thick.
  • Such a signal can be observed easily with a circuit containing a transconductance amplifier and a peak detector.
  • Glutamate pulses are applied and data are collected with a patch clamp amplifier and digitized.
  • The cap is connected to an amplifier, which is in turn connected to a computer that processes the electrical signals.
  • Hair-sized sensors placed in the brain translate those signals to an amplifier.
  • The probe, sensitive enough to pick up electrical signals from a single cell, was wired to a laptop computer and amplifier.
  • Serious money is to be made if the patient can wear a signal amplifier suit.
  • Each of their systems contains a signal processor, an amplifier, and a platelike device that shoots out beams of ultrasound.
  • We therefore included a dummy strain gauge and amplifier, responsive to electrical artifacts but not to strain.
  • And he actually leaned me up against this amplifier.
British Dictionary definitions for amplifier


an electronic device used to increase the strength of the signal fed into it
such a device used for the amplification of audio frequency signals in a radio, etc
(photog) an additional lens for altering the focal length of a camera lens
a person or thing that amplifies
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 amplifier

1540s; agent noun from amplify. Electronic sense is from 1914; shortened form amp is from 1967.

Online Etymology Dictionary, © 2010 Douglas Harper
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amplifier in Culture

amplifier definition

In electronics, a device that takes a small electric signal and converts it into a large one. Amplifiers are used in stereo systems, electric guitars, and loudspeakers.

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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