CONTRIBUTIVE
conducive, contributing, contributive, contributory, tributary
(adjective) 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”
Source: WordNet® 3.1
Etymology
Adjective
contributive (comparative more contributive, superlative most contributive)
Tending to contribute; making a contribution
Source: Wiktionary
Con*trib"u*tive, a.
Definition: Contributing, or tending to contribute. Fuller.
Source: Webster’s Unabridged Dictionary 1913 Edition