Etymology
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responder (n.)

"one who or that which responds or replies," by 1834 of persons; 1867 of devices (telegraphy); agent noun from respond (v.). Meaning "device which automatically retransmits a pulse or signal" is by 1945.

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Definitions of responder

responder (n.)
someone who responds;
Synonyms: respondent / answerer
From wordnet.princeton.edu