Main entry: feeder, confluent, tributary, affluent
Definition: a branch that flows into the main stream
Antonyms: distributary
Definition: a branch of a river that flows away from the main stream and does not rejoin it
Main entry: tributary
Definition: (of a stream) flowing into a larger stream
Antonyms: primary
Definition: of first rank or importance or value; direct and immediate rather than secondary
Main entry: conducive, contributing, contributive, contributory, tributary
Definition: tending to bring about; being partly responsible for
Usage: working conditions are not conducive to productivity; the seaport was a contributing factor in the growth of the city; a contributory factor
Antonyms: noncausal, noncausative
Definition: not causative
Main entry: tributary
Definition: paying tribute
Usage: a tributary colony
Antonyms: unobligated
Definition: not obligated