Etymology
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respondent (n.)

"one who answers" in a lawsuit, disputation, survey, etc., 1520s, from Latin respondentem (nominative respondens), present participle of respondere "respond, answer to, promise in return," from re- "back" (see re-) + spondere "to pledge" (see sponsor (n.)). Related: Respondence "correspondence, act of responding."

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co-respondent (n.)

in law, a joint respondent, one proceeded against along with another or others, 1857, from co- + respondent. "[S]pecifically, in Eng. law, a man charged with adultery, and made a party together with the wife to the husband's suit for divorce." [Century Dictionary].

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