a.

1. 納貢的，附庸的，從屬的[（+to）]
   a tributary nation

   進貢國

2. 輔助的
3. 支流的
   There was a tributary road near the end of the village.

   村的盡頭有條岔道。

n.[C]

1. 進貢國，附庸國[（+to）]
2. 進貢者
3. 支流
   The Missouri River is the chief tributary of the Mississippi.

   密蘇里河是密西西比河的主要支流。

n.

1. a river or stream flowing into a larger river or lake.
2. historical a person or state that pays tribute to another state or ruler.