Tributary /(?)/

1. Paying tribute to another, either from compulsion, as an acknowledgment of submission, or to secure protection, or for the purpose of purchasing peace.

   [Julius] unto Rome made them tributary.

2. Hence, subject; subordinate; inferior.

   He to grace his tributary gods.

3. Paid in tribute.
4. Yielding supplies of any kind; serving to form or make up, a greater object of the same kind, as a part, branch, etc.; contributing; as, the Ohio has many tributary streams, and is itself tributary to the Mississippi.

pl. Tributaries

1. 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.
2. A stream or river flowing into a larger river or into a lake; an affluent.