say it: TRI-byuh-ter-ee
tributary is an adjective and noun meaning "(of a stream) flowing into a larger stream". It carries 4 recorded senses.
(of a stream) flowing into a larger stream
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”
a branch that flows into the main stream
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for tributary come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.