A ruler or state that pays tribute, or a stated sum, to a conquering power, for the purpose of securing peace and protection, or as an acknowledgment of submission, or for the purchase of security
A tributary is a stream or river that flows into a larger one. the Napo river, a tributary of the Amazon. tributaries a stream or river that flows into a larger river
means any stream that flows into a larger stream, or into a lake or reservoir This includes a tributary to a tributary Tributaries to a lake are considered to be tributaries to the outlet stream from the lake unless stated differently in site-specific regulations
A body of water flowing into a larger body of water For example, the Potomac River is a tributary of Chesapeake Bay