Etymology
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amplifier (n.)

1540s; agent noun from amplify. Electronic sense is from 1914; shortened form amp is from 1967. Alternative stentorphone (1921) did not catch on.

updated on November 27, 2013

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Definitions of amplifier from WordNet

amplifier (n.)
electronic equipment that increases strength of signals passing through it;
From wordnet.princeton.edu, not affiliated with etymonline.