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


  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

1540s; agent noun from amplify. Electronic sense is from 1914; shortened form amp is from 1967.

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.

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