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
    

• paying tribute
  • a tributary colony
    

• (of a stream) flowing into a larger stream

Noun

• a branch that flows into the main stream

Related words

• Synonyms: 
  conducive , contributing(a) , contributive , contributory , feeder , confluent , affluent