The Collaborative International Dictionary of English v.0.48:

Reply \Re*ply"\, n.; pl. Replies (-pl?z"). [See Reply, v.
   i., and cf. Replica.]
   That which is said, written, or done in answer to what is
   said, written, or done by another; an answer; a response.
   [1913 Webster]

   Syn: Answer; rejoinder; response.

   Usage: Reply, Rejoinder, Answer. A reply is a distinct
          response to a formal question or attack in speech or
          writing. A rejoinder is a second reply (a reply to a
          reply) in a protracted discussion or controversy. The
          word answer is used in two senses, namely (1), in the
          most general sense of a mere response; as, the answer
          to a question; or (2), in the sense of a decisive and
          satisfactory confutation of an adversary's argument,
          as when we speak of a triumphant answer to the speech
          or accusations of an opponent. Here the noun
          corresponds to a frequent use of the verb, as when we
          say. "This will answer (i.e., fully meet) the end in
          view;" "It answers the purpose."
          [1913 Webster]