Definitions
1.nounA natural water stream that flows into a larger river or other body of water.
2.nounA nation, state, or other entity that pays tribute.
3.adjectiveRelated to the paying of tribute.
4.adjectiveSubordinate; inferior
5.adjectiveYielding supplies of any kind; serving to form or make up, a greater object of the same kind, as a part, branch, etc.; contributing."The Ohio has many tributary streams, and is itself tributary to the Mississippi."