tributarynounmasculine/feminine/ɐfluˈẽtɨ/mediuma·flu·en·tePortuguesEnglishEspanolFrancaisDefinitionA river or stream flowing into a larger river or lake.The Missouri River is a major tributary of the Mississippi.The lake is fed by several small tributaries.syntributaryfeederCommon collocationstributary rivermain tributaryright-bank tributaryEtymologyDo latim *affluente-*, particípio presente de *affluere* (afluir).Related wordsafluirafluênciaconfluente