1.(of a stream) flowing into a larger stream • Similar to: secondary 2. paying tribute - a tributary colony • Similar to: obligated 3. 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, contributive, contributory • Similar to: causative • Derivationally related forms: contribute (for: contributory), contribute (for: contributive), conduce (for: conducive)