The Collaborative International Dictionary of English v.0.48:

Conduce \Con*duce"\, v. i. [imp. & p. p. Conduced; p. pr. &
   vb. n. Conducing.] [L. conducere to bring together,
   conduce, hire; con- + ducere to lead. See Duke and cf.
   Conduct, n., Cond.]
   To lead or tend, esp. with reference to a favorable or
   desirable result; to contribute; -- usually followed by to or
   toward.
   [1913 Webster]

         He was sensible how much such a union would conduce to
         the happiness of both.                   --Macaulay.
   [1913 Webster]

         The reasons you allege do more conduce
         To the hot passion of distemper'd blood. --Shak.

   Syn: To contribute; aid; assist; tend; subserve.
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The Collaborative International Dictionary of English v.0.48:

Conduce \Con*duce"\, v. t.
   To conduct; to lead; to guide. [Obs.]
   [1913 Webster]

         He was sent to conduce hither the princess. --Sir H.
                                                  Wotton.
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WordNet (r) 3.0 (2006):

conduce
    v 1: be conducive to; "The use of computers in the classroom
         lead to better writing" [syn: contribute, lead,
         conduce]