Definitions

1. noun

A river or stream that flows into a larger river or lake.

“The tributary to the Amazon River is home to a diverse array of wildlife.”

2. noun

A contribution, such as money, made to a person or organization, especially a government, in gratitude or admiration.

“The country made a significant tributary to the charity to help those affected by the natural disaster.”

3. adjective

Of or relating to a tributary stream or river.

“The tributary terrain of the region made it prone to flooding during heavy rainfall.”