The Collaborative International Dictionary of English v.0.48:

Respondent \Re*spond"ent\ (-ent), a. [L. respondens, p. pr. of
   respondere.]
   Disposed or expected to respond; answering; according;
   corresponding.
   [1913 Webster]

         Wealth respondent to payment and contributions.
                                                  --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Respondent \Re*spond"ent\, n. [Cf. F. r['e]pondant.]
   One who responds. It corresponds in general to defendant.
   Specifically:
   (a) (Law) One who answers in certain suits or proceedings,
       generally those which are not according to the course of
       the common law, as in equity and admiralty causes, in
       petitions for partition, and the like; -- distinquished
       from appellant.
   (b) One who maintains a thesis in reply, and whose province
       it is to refute objections, or overthrow arguments; --
       distinguished from opponent. --I. Watts.
       [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "respondent":
   accused, answerer, answering, antiphonal, confutative,
   correspondent, defendant, echoic, echoing, libelee, prisoner,
   reacting, reactionary, reactive, reechoing, reflex, reflexive,
   refluent, refutative, rejoining, replier, replying, responder,
   responding, responser, responsive, retroactionary, retroactive,
   returning, revulsive, suspect