The Collaborative International Dictionary of English v.0.48:

Conducive \Con*du"cive\ (k[o^]n*d[=u]"s[i^]v), a.
   Loading or tending; helpful; contributive; tending to
   promote.
   [1913 Webster]

         However conducive to the good or our country.
                                                  --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conducive
    adj 1: tending to bring about; being partly responsible for;
           "working conditions are not conducive to productivity";
           "the seaport was a contributing factor in the growth of
           the city"; "a contributory factor" [syn: conducive,
           contributing(a), contributive, contributory,
           tributary]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "conducive":
   agential, agentival, agentive, aidful, assisting, beneficial,
   conducive to, constructive, contributory, employable, facilitating,
   favoring, forwarding, furthersome, good for, handy, helpful,
   inclined toward, inclining toward, instrumental, intermediary,
   leading to, mediating, mediatorial, ministerial, ministering,
   positive, profitable, promoting, remedial, salutary, serviceable,
   subservient, tending to, therapeutic, useful