The Collaborative International Dictionary of English v.0.48:

Response \Re*sponse"\ (r?*sp?ns"), n. [OF. response, respons, F.
   r['e]ponse, from L. responsum, from respondere. See
   Respond.]
   1. The act of responding.
      [1913 Webster]

   2. An answer or reply. Specifically:
      (a) Reply to an objection in formal disputation. --I.
          Watts.
      (b) (Eccl.) The answer of the people or congregation to
          the priest or clergyman, in the litany and other parts
          of divine service.
      (c) (R.C.Ch.) A kind of anthem sung after the lessons of
          matins and some other parts of the office.
      (d) (Mus.) A repetition of the given subject in a fugue by
          another part on the fifth above or fourth below.
          --Busby.
          [1913 Webster]

WordNet (r) 3.0 (2006):

response
    n 1: a result; "this situation developed in response to events
         in Africa"
    2: a bodily process occurring due to the effect of some
       antecedent stimulus or agent; "a bad reaction to the
       medicine"; "his responses have slowed with age" [syn:
       reaction, response]
    3: a statement (either spoken or written) that is made to reply
       to a question or request or criticism or accusation; "I
       waited several days for his answer"; "he wrote replies to
       several of his critics" [syn: answer, reply, response]
    4: the manner in which something is greeted; "she did not expect
       the cold reception she received from her superiors" [syn:
       reception, response]
    5: a phrase recited or sung by the congregation following a
       versicle by the priest or minister
    6: the speech act of continuing a conversational exchange; "he
       growled his reply" [syn: reply, response]
    7: the manner in which an electrical or mechanical device
       responds to an input signal or a range of input signals