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Definition of: amplifier
Our photo definition of amplifier 
(am′plə·fī′ər) noun
1. One who or that which amplifies or increases.
2. A megaphonelike device for increasing the volume of sound.
3. Electr. A device for increasing the intensity of electric impulses by the control of power supplied by a local source, usually by means of vacuum tubes or dynamos.
4. A loudspeaker.
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