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responder

[ri-spon-der]
noun
  1. a person or thing that responds.
  2. Electronics. the part of a transponder that transmits the reply.
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Origin of responder

First recorded in 1875–80; respond + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for responder

n.

1845 of devices, 1871 of persons, agent noun from respond (v.).

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Online Etymology Dictionary, © 2010 Douglas Harper