Electronics A device, especially one using transistors or electron tubes, that produces amplification of an electrical signal.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "amplifier" in a sentence
"The nice thing about a vinyl record played through a radiogram with a tube (valve) amplifier is that it sounded warm as opposed to bright."
"There was a sudden scratching sound and the hum of an amplifier from the speakers in the ceiling."
"As I tweated, amplifier is an awesome name for an award to win!"