noun
a device or component that increases the power or amplitude of a signal
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The amplifier is a crucial component in the audio system, responsible for boosting the signal strength.
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I just got a new amplifier for my guitar, it's going to make my music sound so much better.
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Dude, that new amp is sick! It's gonna make your guitar shred even harder.
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Her infectious laughter acted as an amplifier, spreading joy to everyone around her.