a person or thing that amplifies or enlarges.
an electronic component or circuit for amplifying power, current, or voltage.

1540–50; amplify + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amplifier (ˈæmplɪˌfaɪə)
1.  an electronic device used to increase the strength of the signal fed into it
2.  such a device used for the amplification of audio frequency signals in a radio, etc
3.  photog an additional lens for altering the focal length of a camera lens
4.  a person or thing that amplifies

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1540s; see amplify. Electronic sense is from 1914; shortened form amp is from 1967.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

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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Example sentences for amplifiers
Input and output variables electronic amplifiers use two variables current and voltage.
Nearly all amplifiers commercially available today are based on integrated circuits.
For the first few rehearsals he used vox and fender amplifiers.
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