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responder

[ri-spon-der] /rɪˈspɒn dər/
noun
1.
a person or thing that responds.
2.
Electronics. the part of a transponder that transmits the reply.
Origin
1875-1880
1875-80; respond + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for responders

responder

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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