WordNet sense 1 (a branch that flows into the main stream):

affluent, confluent, feeder

WordNet sense 2 (being of second rank or importance or value; not direct or immediate):

secondary

WordNet sense 3 (caused by law or conscience to follow a certain course):

obligated

WordNet sense 4 (tending to bring about; being partly responsible for):

conducive, contributory, contributing, contributive

WordNet sense 5 (producing an effect):

causative