This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that amplifies, enlarges, or extends.

n. Electronics A device, especially one using transistors or electron tubes, that produces amplification of an electrical signal.

n. Anything that amplifies, or makes something larger or more intense.

n. An appliance or circuit that increases the strength of a weak electrical signal without changing the other characteristics of the signal.

n. An amp, specif. a particular type of speaker used to amplify voices and musical instruments at live performances.

n. One who or that which amplifies.

n. One who amplifies or enlarges.

n. A lens placed in the tube of a microscope between the object-glass and the eyepiece. See microscope.

n. electronic equipment that increases strength of signals passing through it

"There was a sudden scratching sound and the hum of an amplifier from the speakers in the ceiling."

electronic equipment   

gain   

relay station    booster station    audio amplifier    maser    booster amplifier    relay transmitter    booster    relay link   

detector    circuitry    converter    circuit    transistor    transmitter    input    oscillator    generator    receiver